> > yet: i'm not sure about what to be fixed.
You can also install an old version of Acrobat reader. acroread 3 (you can find the rpm online) comes with the original base 13 fonts (plus Zapf Dingbats), and you can make fontconfig (assuming that's what zathura and evince use) find those as well, in order to display PDFs that do not embed the base 13 fonts. Alternatively, try mupdf, which comes with the URW fonts (the same as those provided with ghostscript), which are compatible with the base 13 fonts (and although they have different names, mupdf and ghostscript have builtin tables to indicate which font replaces which). Under Linux, you can also install acroread 9.5, which still does the best PDF rendering. (But instead of Helvetica it comes with Arial, which doesn't look as nice. You can, however, merge the resources from acroread 3.)