note this is probably a duplicate, in fact I'm sure it must be a duplicate, but I can't find it anywhere. There are questions about font rendering or incorrect fonts in evince, but as far as I can tell, not the specific case I am referring to here.
It seems that evince does not handle display fonts well. If I open a PDF in Acroread (or whatever the PDF reader from Adobe is called nowadays), it looks fine, but when I open the same PDF in Evince, the results look horrible. Here is a comparison:
(Evince is the lower sample)