Programmatically adding red box around a two digit number

Use the comment markup "Square" tool and draw a box.  Then, name the annotation by selecting it and running the following script in the console (name example is "Square1"):

this.selectedAnnots[0].name="Square1";

Also, make it "readonly" so that it can't be resized, moved, or deleted by the end user by running the following script in the console:

this.selectedAnnots[0].readOnly=true;

Also, add the display value to it's contents like this:

this.selectedAnnots[0].contents="72";

Hide the annotation by running the following script in the console:

this.selectedAnnots[0].hidden=true;

Change the hidden property of the annotation to true or false in your calculation, calling it by its name like this:

var anot=this.getAnnot(0,"Square1");
if(75>Number(anot.contents))
{anot.hidden=false}
else
{anot.hidden=true}

Note, the 0 before "Square1" is the page index of the annotation (page 1 in this case).