evince default substitution font

[Bram Kuijper]

Hi all,

I am using evince on gutsy gibbon for viewing my PDFs and I was 
wondering if I could change evince's default substitution font somewhere?

Currently the font used for substitution when documents do not have 
embedded fonts is Sans, which does not render PDFs full of mathematical 
formulas as nicely as for example, Libertine.

Is it possible to change this default substitution font for evince 
somewhere?

thx,
Bram