Hacked site question

[Fellicowh]

I'm trying to help another developer with a hacked site.
OC version is 1.5.6
Can someone tell me if this is a legit file?
admin/adm.php
It feels like this might be our bogus file but I don't have a vanilla install to compare right now.
Thanks for any help.
https://diceus.com/hire-offshore-developers/

[Moe]

If you can't recognize what is legit and what isn't, your only real solution is to wipe it and re-install from a trusted source.