As file format specs leave room for interpretation and sometimes are misunderstood or ignored by the programmers, some well-formed files may be interpreted inconsistently by different tools and libraries. As a result, this can be (ab)used for simple jokes, anti-forensics or to bypass sanitizers which might lead to data exfiltration.
Ange Albertini: Reverse Engineer, author of Corkami
Gynvael Coldwind: His main areas of interest are low-level security (kernel, OS, client), web security and reverse-engineering. Captain of Dragon Sector CTF team :) Currently working as an Information Security Engineer at Google.