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If copy/paste does not work, then you could try OCR.
Mind you it didn't work for me when I tried it.
I had the same issue on a pdf of a really old public domain book and when I took a closer look at the pdf, I came to the conclusion that it was just a collection of photographs of the pages of a physical book. Some of the pages were not exactly straight and some were more faded than others.
Because I prefer using my kindle and because reading such pdf's on my kindle is such a pain, I tried a few things to get an epub text version including using OCR. But although the quality of the images was enough to make it easily readable as a pdf, it obviously was not good enough for OCR, so I basically gave up and read the pdf on my computer
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