When I opened the file in hex editor I saw 2 distinct values: E28083 and 20 (space) I replaced all the occurences of E28083 with 0 and 20 with 1 and decoded it from binary

# nactf{thebuffalocauliflowersareorganizinganuprising2398hf918fh98918y}

Original writeup (https://github.com/mar232320/ctf-writeups/blob/main/nactf/2022/warning2.md).