Edit: emailed this person, told them to be more careful about what they upload to the server. Thanks for the advice.
Long story kind of short, I found a strange file on the server at work (Arabic file name, company working language is definitely not Arabic) opened it up (I was intrigued by the cover illustration) and after some translating I discovered the book was The Manipulated Man. Checked the file properties, I know who uploaded the file to the server, but I have absolutely no relationship with this person (besides working for the same company).
Where you tankie bastards come in:
Should I do nothing?
Should I confront this person? If yes, how should I confront this person?
I know that they are listed as the owner of the file on the server.
At this point I have decided that there isn't much to gain, beyond telling the person to be mindful of what they upload onto the server in a nicely worded email.