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PDF is a valid ebook format. I have read a couple of PDF books from the public library (Overdrive) on my Sony PRS-T1 with only minor issues - page turns were slower than with epub, and when I tried to press/select a word to look up in the dictionary, the whole line would automatically be selected instead of just the word.
However, the public library clearly stated that the format as "pdf" so I knew what I was getting. (Not to mention that since it was a library book, if it didn't work on my reader I would not have been out any money.)
I would not know what "adobe encrypted DRM" was either. Given that most ebookstores sell mainly kindle and epub books, I would have guessed that Adobe DRM would be epub. I think the OP was justified in complaining, and the store should make clear in the product description that the book is in PDF format.
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