It's doing well but not great, so far.
"Its first markets of Australia, Greece, and New Zealand showed that Mel Gibson's film will be one of the 25 biggest releases of the year in most territories at least"
http://www.boxofficemojo.com/intl/weekend/2004/10.htm
The article with the link has an interesting analysis of the international prospects. It'll be really interesting to see what it does in Europe.
Thanks for the link, I assume the Passion will be banned in most middle eastern countries and that is a shame. Darkness sure has a strong hold on that area of the world. But it would be interesting to see if that area could grasp the meaning of the film and if so, what the reaction would be.