You might be able to confirm itimpi's thought by running it through MobiPocket Creator which is a free download.
It will take the PDF and create an HTML file. You can look at the resulting files. You will probably find as I did just yesterday for a book from the Air Force Historical Section that the resulting HTML file is about 6 kb long and there is an image for every single page in the book.
If you are either compulsive or determined, you can go and download freeocr. It will allow you to optically recognize every single image page in the book, one by one. Odds are they will take some cleaning up.
You might look at books which are available here in another forum, archive.org, or gutenberg.org where the work or most of it will have already been done for you.
In ebooks we are still on the wild frontier. Strangers can walk into town without being shot these days, but the streets are dirt and there is the occasional cow pie.
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