random distribution of objects on artboard

This .jsx still works, though I like Ton's suggestion better since you get a preview option.

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var doc=app.activeDocument;

var s=doc.selection;

///////////////////////////////////////////////////////////////////////////////////////////////////WIDOW/////////////////////////////////////////////////////////////////////////////

var myWindow=new Window("dialog","Randomizer");

myWindow.orientation = "column";

//Scale X

    var scaleXGroup= myWindow.add("group");

    scaleXGroup.orientation = "column";

    var scaleXText=scaleXGroup.add("statictext", undefined, "Scale X");

        var scaleXGroup1=scaleXGroup.add("group");

        scaleXGroup1.orientation = "row";

        var scaleXGroupMin=scaleXGroup1.add("group");

        scaleXGroupMin.orientation = "column";

            var scaleXGroupMin1=scaleXGroupMin.add("group");

            scaleXGroupMin1.orientation = "row";

                var scaleXTextMin=scaleXGroupMin1.add("statictext", undefined, "Min");

                var scaleXMinValue = scaleXGroupMin1.add ('edittext {text: 100, characters: 3, justify: "right", active: true}');

            var scaleXMinSlider = scaleXGroupMin.add ('slider {minValue: 0, maxValue: 100, value: 100}');

        scaleXMinSlider.onChanging = function () {scaleXMinValue.text = scaleXMinSlider.value ;

                                                                        if(check1.value){

                                                                            scaleYMinValue.text = scaleXMinSlider.value;

                                                                            }else{  scaleYMinValue.text = scaleYMinSlider.value;}

                }

        scaleXMinValue.onChanging = function () {scaleXMinSlider.value = Number (scaleXMinValue.text) ;

                                                                     if(check1.value){

                                                                        scaleYMinSlider.value = Number (scaleXMinValue.text) ;

                                                                        }else{ scaleYMinSlider.value = Number (scaleYMinValue.text) ;}

                }

        scaleXGroup1.add ("panel", [100,0,103,50]);

        var scaleXGroupMax=scaleXGroup1.add("group");

        scaleXGroupMax.orientation = "column";

            var scaleXGroupMax1=scaleXGroupMax.add("group");

            scaleXGroupMax1.orientation = "row";

                var scaleXTextMax=scaleXGroupMax1.add("statictext", undefined, "Max");

                var scaleXMaxValue = scaleXGroupMax1.add ('edittext {text: 100, characters: 3, justify: "right", active: true}');

            var scaleXMaxSlider = scaleXGroupMax.add ("slider", undefined, 100, 100, 1000);

        scaleXMaxSlider.onChanging = function () {scaleXMaxValue.text = scaleXMaxSlider.value;

                                                                             if(check1.value){

                                                                                scaleYMaxValue.text = scaleXMaxSlider.value;

                                                                                }else{  scaleYMaxValue.text = scaleYMaxSlider.value;}

                                                                        }

        scaleXMaxValue.onChanging = function () {scaleXMaxSlider.value = Number (scaleXMaxValue.text);

                                                                              if(check1.value){

                                                                                scaleYMaxSlider.value = Number (scaleXMaxValue.text) ;

                                                                                }else{ scaleYMaxSlider.value = Number (scaleYMaxValue.text) ;}

                                                                        }

        var check1 = myWindow.add ("checkbox", undefined, "uniform scale");

        myWindow.add ("panel", [0,20,250,23]);

//Scale Y

    var scaleYGroup= myWindow.add("group");

    scaleYGroup.orientation = "column";

    var scaleYText=scaleYGroup.add("statictext", undefined, "Scale Y");

        var scaleYGroup1=scaleYGroup.add("group");

        scaleYGroup1.orientation = "row";

        var scaleYGroupMin=scaleYGroup1.add("group");

        scaleYGroupMin.orientation = "column";

            var scaleYGroupMin1=scaleYGroupMin.add("group");

            scaleYGroupMin1.orientation = "row";

                var scaleYTextMin=scaleYGroupMin1.add("statictext", undefined, "Min");

                var scaleYMinValue = scaleYGroupMin1.add ('edittext {text: 100, characters: 3, justify: "right", active: true}');

            var scaleYMinSlider = scaleYGroupMin.add ('slider {minValue: 0, maxValue: 100, value: 100}');

        scaleYMinSlider.onChanging = function () {   if(check1.value){

                scaleYMinValue.text = scaleXMinSlider.value;

                }else{  scaleYMinValue.text = scaleYMinSlider.value;}

            }

        scaleYMinValue.onChanging = function () {  if(check1.value){

                scaleYMinSlider.value = Number (scaleXMinValue.text) ;

                }else{ scaleYMinSlider.value = Number (scaleYMinValue.text) ;} }

        scaleYGroup1.add ("panel", [100,0,103,50]);

        var scaleYGroupMax=scaleYGroup1.add("group");

        scaleYGroupMax.orientation = "column";

            var scaleYGroupMax1=scaleYGroupMax.add("group");

            scaleYGroupMax1.orientation = "row";

                var scaleYTextMax=scaleYGroupMax1.add("statictext", undefined, "Max");

                var scaleYMaxValue = scaleYGroupMax1.add ('edittext {text: 100, characters: 3, justify: "right", active: true}');

            var scaleYMaxSlider = scaleYGroupMax.add ("slider", undefined, 100, 100, 1000);

        scaleYMaxSlider.onChanging = function () {

            if(check1.value){

                scaleYMaxValue.text = scaleXMaxSlider.value;

                }else{  scaleYMaxValue.text = scaleYMaxSlider.value;}

            }

        scaleYMaxValue.onChanging = function () {

            if(check1.value){

                scaleYMaxSlider.value = Number (scaleXMaxValue.text) ;

                }else{ scaleYMaxSlider.value = Number (scaleYMaxValue.text) ;}

            }    

        myWindow.add ("panel", [0,20,250,23]);

        myWindow.add ("panel", [-10,20,250,23]);

//Opacity

    var opacityGroup= myWindow.add("group");

    opacityGroup.orientation = "column";

    var opacityText=opacityGroup.add("statictext", undefined, "Opacity");

        var opacityGroup1=opacityGroup.add("group");

        opacityGroup1.orientation = "row";

        var opacityGroupMin=opacityGroup1.add("group");

        opacityGroupMin.orientation = "column";

            var opacityGroupMin1=opacityGroupMin.add("group");

            opacityGroupMin1.orientation = "row";

                var opacityTextMin=opacityGroupMin1.add("statictext", undefined, "Min");

                var opacityMinValue = opacityGroupMin1.add ('edittext {text: 100, characters: 3, justify: "right", active: true}');

            var opacityMinSlider = opacityGroupMin.add ('slider {minValue: 0, maxValue: 100, value: 100}');

        opacityMinSlider.onChanging = function () {opacityMinValue.text = opacityMinSlider.value }

        opacityMinValue.onChanging = function () {opacityMinSlider.value = Number (opacityMinValue.text) }

        opacityGroup1.add ("panel", [100,0,103,50]);

        var opacityGroupMax=opacityGroup1.add("group");

        opacityGroupMax.orientation = "column";

            var opacityGroupMax1=opacityGroupMax.add("group");

            opacityGroupMax1.orientation = "row";

                var opacityTextMax=opacityGroupMax1.add("statictext", undefined, "Max");

                var opacityMaxValue = opacityGroupMax1.add ('edittext {text: 100, characters: 3, justify: "right", active: true}');

            var opacityMaxSlider = opacityGroupMax.add ("slider", undefined, 100, 0, 100);

        opacityMaxSlider.onChanging = function () {opacityMaxValue.text = opacityMaxSlider.value }

        opacityMaxValue.onChanging = function () {opacityMaxSlider.value = Number (opacityMaxValue.text) }    

        myWindow.add ("panel", [0,20,250,23]);

        myWindow.add ("panel", [-10,20,250,23]);

//Move X

    var moveXGroup= myWindow.add("group");

    moveXGroup.orientation = "column";

    var moveXText=moveXGroup.add("statictext", undefined, "Move X");

        var moveXGroup1=moveXGroup.add("group");

        moveXGroup1.orientation = "row";

        var moveXGroupMin=moveXGroup1.add("group");

        moveXGroupMin.orientation = "column";

            var moveXGroupMin1=moveXGroupMin.add("group");

           moveXGroupMin1.orientation = "row";

                var moveXTextMin=moveXGroupMin1.add("statictext", undefined, "Min");

                var moveXMinValue = moveXGroupMin1.add ('edittext {text: 0, characters: 3, justify: "right", active: true}');

            var moveXMinSlider = moveXGroupMin.add ("slider", undefined, 0, -1000, 0);

        moveXMinSlider.onChanging = function () {moveXMinValue.text = moveXMinSlider.value }

        moveXMinValue.onChanging = function () {moveXMinSlider.value = Number (moveXMinValue.text) }

        moveXGroup1.add ("panel", [100,0,103,50]);

        var moveXGroupMax=moveXGroup1.add("group");

        moveXGroupMax.orientation = "column";

            var moveXGroupMax1=moveXGroupMax.add("group");

            moveXGroupMax1.orientation = "row";

                var moveXTextMax=moveXGroupMax1.add("statictext", undefined, "Max");

                var moveXMaxValue = moveXGroupMax1.add ('edittext {text: 0, characters: 3, justify: "right", active: true}');

            var moveXMaxSlider = moveXGroupMax.add ("slider", undefined, 0, 0, 1000);

        moveXMaxSlider.onChanging = function () {moveXMaxValue.text = moveXMaxSlider.value }

        moveXMaxValue.onChanging = function () {moveXMaxSlider.value = Number (moveXMaxValue.text) }

        myWindow.add ("panel", [0,20,250,23]);

//Move Y

    var moveYGroup= myWindow.add("group");

    moveYGroup.orientation = "column";

    var moveYText=moveYGroup.add("statictext", undefined, "Move Y");

        var moveYGroup1=moveYGroup.add("group");

        moveYGroup1.orientation = "row";

        var moveYGroupMin=moveYGroup1.add("group");

        moveYGroupMin.orientation = "column";

            var moveYGroupMin1=moveYGroupMin.add("group");

            moveYGroupMin1.orientation = "row";

                var moveYTextMin=moveYGroupMin1.add("statictext", undefined, "Min");

                var moveYMinValue = moveYGroupMin1.add ('edittext {text: 0, characters: 3, justify: "right", active: true}');

            var moveYMinSlider = moveYGroupMin.add ("slider", undefined, 0, -1000, 0);

        moveYMinSlider.onChanging = function () {moveYMinValue.text = moveYMinSlider.value }

        moveYMinValue.onChanging = function () {moveYMinSlider.value = Number (moveYMinValue.text) }

        moveYGroup1.add ("panel", [100,0,103,50]);

        var moveYGroupMax=moveYGroup1.add("group");

        moveYGroupMax.orientation = "column";

            var moveYGroupMax1=moveYGroupMax.add("group");

            moveYGroupMax1.orientation = "row";

                var moveYTextMax=moveYGroupMax1.add("statictext", undefined, "Max");

                var moveYMaxValue = moveYGroupMax1.add ('edittext {text: 0, characters: 3, justify: "right", active: true}');

            var moveYMaxSlider = moveYGroupMax.add ("slider", undefined, 0, 0, 1000);

        moveYMaxSlider.onChanging = function () {moveYMaxValue.text = moveYMaxSlider.value }

        moveYMaxValue.onChanging = function () {moveYMaxSlider.value = Number (moveYMaxValue.text) }    

        myWindow.add ("panel", [0,20,250,23]);

        myWindow.add ("panel", [-10,20,250,23]);

        var check2 = myWindow.add ("checkbox", undefined, "Random roteted");

        myWindow.add ("panel", [0,20,250,23]);

        myWindow.add ("panel", [-10,20,250,23]);

        var ok_button = myWindow.add ("button", undefined, "OK");

      ok_button.onClick = randimizeFunc;

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////   

if(s.length<1){

    alert("No selected objects");

    } else{

       myWindow.show ();

        }

///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

   function randimizeFunc(){

       myWindow.hide();

        var xScaleMin=scaleXMinSlider.value;

        var xScaleMax=scaleXMaxSlider.value;

        var yScaleMin=scaleYMinSlider.value;

        var yScaleMax=scaleYMaxSlider.value;

        var xMoveMin=moveXMinSlider.value;

        var xMoveMax=moveXMaxSlider.value;

        var yMoveMin=moveYMinSlider.value;

        var yMoveMax=moveYMaxSlider.value;

        var opacityMin=opacityMinSlider.value;

        var opacityMax=opacityMaxSlider.value;

        var rot=check2.value;

        var unifScale;

        for(var i=0;i<s.length;i++){

            if(check1.value){

                unifScale=xScaleMin+Math.random()*(xScaleMax-xScaleMin);

                s.resize(unifScale,unifScale);

                }else{

                             if(xScaleMin!=xScaleMax){

                            s.resize(xScaleMin+Math.random()*(xScaleMax-xScaleMin),100);

                            }

                            if(yScaleMin!=yScaleMax){

                            s.resize(100,yScaleMin+Math.random()*(yScaleMax-yScaleMin));

                            }

                    }

                if(opacityMin!=opacityMax){

                    s.opacity=(opacityMin+Math.random()*(opacityMax-opacityMin));

                    } else{

                         s.opacity=(opacityMin);

                        }

                 if(xMoveMin!=0 || xMoveMax!=0){

                    s.translate(Math.random()*(xMoveMax-xMoveMin)+xMoveMin);

                    }

                    if(yMoveMin!=0 || yMoveMax!=0){

                    s.translate(0,Math.random()*(yMoveMax-yMoveMin)+yMoveMin);

                    }

                 if (rot){

                     s.rotate (Math.random()*360);

                     }

            }

                }

Or try Object > Transform > Transform Each... with Move and the Random checkbox checked.

How about using the symbol sprayer tool?