As per the title, it was fairly obvious that this was some form of javascript. And I almost didn't recognize it as JSFuck obfuscation. (Who would've thought that a CTF catered to middle-schoolers would be using expletives?)
Anyways, I just stuck it into this deobfuscater here: https://enkhee-osiris.github.io/Decoder-JSFuck/
And skimming the text, I saw the flag.