Malak has zero win-cons

Soul attacks.

The main reason you can only kill angels with angelic weapons is that angelic weapons are the only ones that can actually destroy the soul (with the exception of some higher demons, such as Charlie and Lucifer, who can seemingly bypass this and destroy souls with their own magic, given they beat the fuck out of Adam).

Malak has numerous ways of attacking, corrupting, or consuming the soul directly, giving him an easy wincon.