Yes. Commonly found virus sizes & auto renaming you will see can be seen here: Virus thread: Typical virus spam file sizes - Make a note of them (click on blue link to see)

They spam the network in an attempt to prevent copyright file sharing. Some files have viruses, some are deliberately corrupted in some form or fashion, some are audio sounds, some audio songs with overdubs, some are image adverts, small videos tend to be adverts for porn sites.

Good idea to add certain words to your keyword filter to block various junk spam from your search results; check both links within this one: Direct instructions to eliminate porn from results