Update: Feb 19. 2015
We have been adding pcaps to the collection so remember to check out the folder ( Pcap collection) for the recent pcaps.
I had a project to test some malicious and exploit pcaps and collected a lot of them (almost 1000) from various public sources. You can see them in the PUBLIC folder. The credits go to the authors of the pcaps listed in the name of each file. Please visit their blogs and sites to see more information about the pcaps, see their recent posts, and send them thanks. The public pcaps have no passwords on them.