It looks like you might have already taken care of this; it appears the s_nakamoto sourceforge account has been compromised:

https://bitcointalk.org/index.php?topic=775174.0;all

Bitcoin project software development has moved to github, and we are self-hosting binary downloads. We kept the sourceforge project so old links continued to work, but considering the compromise of the s_nakamoto account the best course of action might be to entirely delete the sourceforge bitcoin project.

You can contact me at gavin@bitcoinfoundation.org with any questions or concerns.

Gavin Andresen

Chief Scientist, Bitcoin Foundation