It doesn't have SR stats that I know of, but it had stats in Earthdawn, and the equivalents can be roughly approximated to a degree. (The "step" rolled in Earthdawn is kinda sorta equivalent to the size of the dice pool in SR4: the Attribute adds an amount ranging from 1-7 for starting humans, and the skill/talent adds its rating.)
In which case, it has 38 dice for attack with damage 40, 34 dice to defense, an initiative of 35 with either 3 or 6 Initiative Passes, armor & mystic armor 40, Edge 20 (or Edge 50... depends on which Karma stat you consider equivalent to Edge), 40 dice for Spellcasting, all the spells of an 8th Circle Wizard (the highest level in the ED core book... Circles 9-15 were in the ED Companion), an ungodly number of boxes on its Damage Track... and that doesn't even begin to cover its Horror Powers, many of which have no SR equivalent:
Animate Dead = raises a corpse as a zombie on the spot
Corrupt Karma = you can't use your Edge
Curse Luck = reduces your dice rolls, similar to the Great Dragons' Twist Fate
Damage Shift = you take the damage that it was supposed to take
Horror Mark = it can track you anywhere forever until you kill the Horror, damage you from 10 miles away, enter your mind from 5,000 miles away
Horror Thread = the Horror can control you; Verjigorm has used this on the captured dragons it's spend millenia corrupting
Thought Worm = it telepathically enters your mind and plants a suggestion; if you refuse to obey, you take damage
Unnatural Life = raises a corpse from the grave, but this time the undead retains all the skills it had in life
The payoff for a group that actually managed to kill Verjigorm was 2,000,000 Legend Points. Which is about enough to given almost anyone an instant jump to "Living Legend/Figure of Myth" status.
Verjigorm intends to replace all sentient life on Earth with its own corrupted versions. It's been sitting out the Scourges to prapare for its next move for about 15,000 years.
We are not ready.
