Most of (anti-) malware researchers focus on malware samples, because it's only natural in this line of work. For a while now I try to focus on the opposite ; good files (primarily PE file format). While it may sound boring & mundane, maybe even somehow trivial, this is actually a very difficult task!

https://www.hexacorn.com/blog/2022/03/04/good-file-what-is-it-good-for-part-1/