Here’s the deal. If you open the pdf in Illustrator and press apple-Y to see outlines, you can clearly see boxes that have been placed on top of areas (including the birthdate). If this were a scan of a document, it would be flattened (one layer). There should be absolutely no boxes on a scan unless something has been added on top. See below:
http://i56.tinypic.com/2pt30jq.png