The risk is always there... but you can always check the hash of the iso, if it's the same as on microsofts site, and then check the crack/patch/activator/... on virustotal.

Movies, series, music,.. are usually in file formats not really suitable to carry malware (unless you click on the movie.mp4.exe, but most tech-savy users, who know how to pirate, also know not to do that).