I believe that particular attack has armor piercing, so it’ll hit you even through Heavy Power Armor. I fight them in basic armor all the time and do perfectly fine. The attack itself wouldn’t do much damage even if you were wearing say, a Survivor Trenchcoat. I’m not suggesting you try this out, though.
Also, Jabberwocks are probably among the top five most deadly non-robots in the game, along with the Shoggoth and the Zombie Bio-Operator. If you know what you’re doing, they actually aren’t too deadly (most of a Bio-Operator’s power comes from its Zapback ability). Like Coolthulhu said, they’re actually quite wimpy.
PK Mod variants are slightly more dangerous, because they have the psionic Fear attack that the Amigara Horrors have. Any badass survivor can take down 9 normal Jabberwocks at a time. It’d insanely hard to take down 9 enhanced Jabberwocks because of their stacking paralysis.
Luckily, you pretty much never naturally encounter more than one Jabberwock at a time.