I am using Fedora 20 32 bit OS. Fully updated.
I have a folder that has a bunch of files, which I downloaded a few months ago. I do not remember how I downloaded them (ie) using wGet, just simple download in Firefox or KTorrent. But they are not known files belonging to popular software (Adobe Reader, WinZip etc) nor operating systems (Ubuntu, Fedora etc) etc. Some of them are PDFs and images etc.
After downloading them, I changed their names. So I can't even copy their names and paste into Google to find which sites they came from.