Depending on the particular PDF, you may well find it quite readable on the Cybook without having to convert it, as the Cybook does support non-DRMed PDFs. If the text is too small but you have the ability to edit the PDF itself, just change the PDF's own formatting (decrease margins to free up more screen room, change paper size, etc.) and re-save as a PDF formatted more appropriately for your screen size. The Cybook may not provide the best of support (reflow, etc.) for PDFs in general but if the PDFs are designed specifically for use on them, there's no reason that a PDF can't be used directly on it.
Sometimes, even scanned, non-OCRed, A4-size PDFs can be quite readable. I've tested it with a couple of out-of-print zines and had reasonably good results.
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