MACROMEDIA JSFL Deobfuscator or MJD is a small dynamic library for Adobe Animate that decodes obfuscated JSFL files into readable and editable JSFL files in any IDE
This library works only on Adobe Animate 22.0.3 on Windows system. If you need support for another version open a new issue
Download dll file from releases and put it in the folder: C:\Users\{USER NAME}\AppData\Local\Adobe\Animate {VERSION}\{PROGRAM LANGUAGE CODE}\Configuration\External Libraries
After that, run one of jsfl scripts in "jsfl" folder.
You can decode whole folder or just one file as you wish.
Obfuscated jsfl files have a header of 16 bytes: 00MACROMEDIAOBFU or hex 00 00 4D 41 43 52 4F 4D 45 44 49 41 4F 42 46 55
After that comes 1 byte which probably means the version of the file. Usually equal to 1
Everything after that is encrypted with "DES / EBC / pcks5 padding"
It is very likely that algorithm may differ from original implementations and ideas. After several attempts to repeat code using public libraries and code implementations, I did not manage to get desired result, maybe I just tried badly.
DES key for Animate 22.0.3: 25 40 76 75 34 92 C4 40
I heavily modified mm_jsapi.h, which at least works, unlike what Adobe provides.
I'm not sure if all the "JS_*" functions work correctly, but at least the most needed ones work for sure.
Funny thing is, Adobe Animate actually provides a lot more features in mm_env, but these new features are not documented anywhere, thanks again to Adobe for being indifferent.