Note PDF is perfectly open format, a perfectly *bad* open format, but still an open format.
What you're asking to do is called a non-reflowable conversion. Creating a non-reflowable epub version of a pdf is pointless, it doesn't get you the primary advantage of epub - resolution independence. As such I am not personally interested in this, but feel free to pursue it yourself. Note there are plenty of tools out there that generate pdf->non reflowable html, or even non reflowable pdf optimized for small screen, for example k2pdfopt, pdftohtml, etc.
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