I am running a SharePoint 2010 search with the search criteria of "pdf". As I would expect, I get all pdf documents in my site collection back in the Search result set.
What's interesting is that I also have a MS Word document come up in my Search results. I opened it and search for "pdf" and nothing was found in the word document. Even more interesting, I opened the MS Word document in Notedpad and viola I can see the phrase "pdf" in the document.
Any idea why an MS Word document would contain "pdf"?