Is it hard to make an ePub format book along with a PDF file? I really dislike the way PDF files display on my small Sony Ereader (especially with programming

Is it hard to make an ePub format book along with a PDF file? I really dislike the way PDF files display on my small Sony Ereader (especially with programming books where there is inset code paragraphs and zooming-in messes their layout completely). From my experience, EPub handles the wrapping much better.