Originally Posted by Taco John
I've never heard of a scanner that will separate things into layers automatically. I know there are process that you can do within photoshop to do that, but for what reason anybody would want to do this before releasing a document like this to public, I don't know.
I don't know every scanner out there but any scanner (ie a Xerox WorkCentre) that uses MRC will automatically creates multiple rasters that will show up as layers in Illustrator when the PDF is imported. That alone should really lay this to rest.
So once again, my thought is that if you take the original, copy it onto safety paper then stamp and sign that, then scan it to PDF using a Xerox... you will get similar if not the exact same results. And that is probably what happened if the doc is indeed legit.