Which malware is being detected? From a quick read on XDA, it seems as if the bootloader is locked and you might not have an easily flashable ROM as your solution.

Reseting it will still leave some files behind. And if the files have been placed in the right locations, they will persist even if you reset the device. It needs to have its entire OS removed, refreshed, rewritten and via ADB that's trivial if you can get past a locked bootloader.

Not so the case with the HUDL. But that's after a few quick reads... which landed he here eventually. I'll keep looking, but not so sure I'll be of any help.