// Carbon Copy pages in the PDF file 
// IMPORTANT: Set Output Options to the filename you need

// CHANGE THIS NUMBER: IT'S NUMBER OF ADDITIONAL COPIES 
var nNumCopies = 2; // make 1 additional copy(es) of each page

try {

var newName = this.path;
var filename = newName.replace(".pdf","_Original.pdf"); // save a copy of original document
this.saveAs(filename);

var Num = this.numPages;
var nNumDups = nNumCopies+1; 

for (var i = 0; i < Num; i++) {
    for (var j = 0; j < nNumCopies; j++) {
        k = i*nNumDups + j;
        this.insertPages({ nPage: k, cPath:newName, nStart:i });
        }
    }

// set page labels: number each copy with a label
for (var k = 0; k < this.numPages; k+= nNumDups) 
{
     this.setPageLabels(k,[ "D", "Copy ", 1]);   
}

}
catch(e)
{
    app.alert(e);
}