From Pathfinder Society Quest #16: The Winter Queen's Dollhouse, which isn't enabled.

Giant Mouse

CREATURE 0

Perception +6

Skills Acrobatics +5, Athletics +3, Stealth +6

Str +0, Dex +3, Con +2, Int -4, Wis +0, Cha +2

AC 15; Fort +3, Ref +9, Will +3

HP 14

Skittish

Trigger The giant mouse is hit with a melee attack

Effect The giant mouse takes a step after the effects of the triggering attack are resolved.

Speed 25 feet

Melee Bite +6 (finesse), Damage 1d4+2 piercing

Pathfinder Society Quest #16: The Winter Queen's DollhouseOGL