According to the Warframe Wiki :

Has multiple damage instances; projectile direct-hit, explosion, and direct-hit DoT.

Projectile direct-hit does 1.875x the Zaw's damage, with a damage distribution of 33% Impact, 33% Puncture, and 33% Slash damage.

The explosion does 5x the Zaw's damage, with a damage distribution of 100% Viral damage.
Explosion has a forced Impact proc.
The range of the explosion is an 8-meter radius.

The direct-hit DoT does 1x the Zaw's damage, with a damage distribution of 100% Blast damage.

The projectile can be launched by sliding in the air while Heavy Attacking in order to make use of a Heavy Attack's increased damage.
The effects of [Killing Blow] apply, same with any crit mod that has a 2x bonus on heavy attacks. (e.g. [True Steel])
"On heavy attack" mod effects apply on direct hits and the explosion (e.g. Life Strike, Dispatch Overdrive, Carnis Mandible)

https://warframe.fandom.com/wiki/Exodia_Contagion