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You can't embed a PDF in an epub. Epub is a renamed .zip file, with some metadata attached to an HTML file or set of HTML files. Just like you can't embed a PDF inside an HTML file, you can't put one in an epub. You can make a link to one, but how that works depends on the software involved.
You might be able to make a link to a PDF file outside of the epub--but whether that would work depends on the software used to read the epub.
Zooming in on a PDF depends on the software used to read the PDF. On a Kindle or Sony 505, for example, there's no zoom option, so it doesn't matter if the PDF was used or not--readers would still be stuck with whatever was viewable on their screen. PDFs aren't inherently zoom-able; that depends on the reading software. (Just like making the map a jpg or png might be zoom-able if it were being read on a PC-based epub reader instead of a portable device.)
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