I would love to change the default font that comes with a pdf that i have, i would like to pick one from my system font cache: how i can do that ?
I am used with evince but any pdf reader will be fine if will support custom fonts.
Correct me if I'm wrong, but I don't think that's possible. The nature of a PDF file is that the layout is fixed so that it always looks the same.
From wikipedia: "Each PDF file encapsulates a complete description of a fixed-layout flat document, including the text, fonts, graphics, and other information needed to display it".
If you want to edit the PDFs you could try this (first hit on Google), or just search for another PDF editor.