script to copy color from object below

Updated:

#target illustrator
function test(){
    function isSquare(item){
        if(item.pathPoints.length > 4){
            return false;
        }
        for(var i=0; i<item.pathPoints.length; i++){
            var thisPoint = item.pathPoints;

            if(Math.floor(thisPoint.leftDirection[0]) !=  Math.floor(thisPoint.rightDirection[0]) ||
                Math.floor(thisPoint.leftDirection[1]) !=  Math.floor(thisPoint.rightDirection[1]) ||
                Math.floor(thisPoint.leftDirection[0]) !=  Math.floor(thisPoint.anchor[0]) ||
                Math.floor(thisPoint.leftDirection[1]) !=  Math.floor(thisPoint.anchor[1])){
                return false;
            }
        }
        return true;
    }
    if(app.documents.length > 0){
        var doc = app.activeDocument;
        for(var i=0; i<doc.pathItems.length; i++){
            var thisPath = doc.pathItems;

            if(isSquare(thisPath)){
                var v = thisPath.geometricBounds;
                for(var j=0; j<doc.pathItems.length; j++){
                    var thisInnerPath = doc.pathItems;
                    if(thisInnerPath != thisPath){
                        var v1 = thisInnerPath.geometricBounds;
                        if(v1[0] >= v[0] && v1[2] <= v[2] && v1[1] <= v[1] && v1[3] >= v[3]){
                            thisInnerPath.fillColor = thisPath.fillColor;
                        }
                    }
                }
            }
        }
    }
}
test();