create Duplicate Pages Acrobat XI OSX

duplicatePages.js

function duplicatepages() {
         
  try {
     var r = this.getPageBox();
        var w = r[2] - r[0];
        var h = r[1] - r[3];
        var oldD = this;
        var newD = app.newDoc({ nWidth: w, nHeight: h }); 
        for(var p=oldD.numPages-1; p>=0; p--) {
                pageFile = "/Volumes/Daten/tmp/acrobat/"+"page.pdf";
                oldD.extractPages({ cPath: pageFile, nStart: p });
                newD.insertPages({ cPath: pageFile, nPage: -1 });
                newD.insertPages({ cPath: pageFile, nPage: -1 });
                // File.delete(pageFile);
        }
        return true;
  } 
  catch(e)
  {
  app.alert("Processing error: "+e)
  }
}