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@Broadback - imagine taking a screenshot of this forum page. That is what your particular PDF contains - an image of the text. So when you try to display that image in an EPUB or MOBI, it gets scaled down to fit on the smaller page size, and hence everything becomes unreadable.
Instead what you really want is the raw text, not an image of the text. Your particular PDF book was undoubtedly made by someone scanning the pages of a hardcopy version. What they have not done is the next step of OCR - turning that image into text, that can be reflowed and resized (hence making it potentially convertible to another format). There is software out there to do an OCR conversion of a PDF, but then you will hit all the issues of OCR errors (where it can't quite recognise certain letters etc) let alone issues of graphics, tables etc for some books. So then you have a whole proofing and reformatting step required.
All of which points back to why the PDF sticky exists - basically PDF is the worst possible format to try to convert from. In many/most cases, it is just not worth attempting to even try to, unless you are prepared to spend the many hours sorting out the mess. Either get the book in the format your device natively supports, or get a tablet reader with a large screen which can make reading PDFs more tolerable (and hence not requiring a conversion).
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