Sounds like it's been rasterized and doesn't contain any embedded fonts/text. Your best bet with this is two-pronged:
a) run an OCR program against the 1000+ page PDF and hope for the best. This will take quite a long time and if the PDF has a lot of images, will be a major PITA.
b) use PDFRasterfarian on it to have the pages formated to the right size for the Reader and does all its graphic enhancements to the PDF to make it optimal for the Reader. This will cut the final size of the book considerably; I've noticed a 30-60% reduction in size from the original PDF when converted to LRF.
Good luck!
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