🚀 go-pugleaf

Not a good one, but it works:

if(app.documents.length > 0){
  var myDoc = app.activeDocument;
  var bounds = new Array();
  bounds[0] = 0;
  bounds[1] = 0;
  bounds[2] = myDoc.documentPreferences.pageHeight;
  bounds[3] = myDoc.documentPreferences.pageWidth;
  //Rectangle fit to Page
  myDoc.pages[0].rectangles.add({geometricBounds: bounds, strokeWeight: 1, strokeColor: "Black", fillColor: "None"});
  //Add 4 Guides
  myDoc.guides.add({orientation: HorizontalOrVertical.horizontal, location: 2});
  myDoc.guides.add({orientation: HorizontalOrVertical.horizontal, location: myDoc.documentPreferences.pageHeight-2});
  myDoc.guides.add({orientation: HorizontalOrVertical.vertical, location: 2});
  myDoc.guides.add({orientation: HorizontalOrVertical.vertical, location: myDoc.documentPreferences.pageWidth -2});
  }else{
  alert("No document open!");
  }