And you're sure it hasn't been accessed from a different IP? I only had one FTP account for my site, but that didn't stop a hacker using it to upload a file.
If you're sure that the directory or the file didn't used to be there, then I'd say you have a problem. If you think you might just not have noticed it, then who knows? A search for that title leads to the University of Central Florida site. Maybe somebody decided to save a copy of the page?