Ja, det bryter osynligheten
Per det magiska kapitlet i Core Rulebook:
All offensive combat actions, even those that don't damage opponents, are considered attacks. Attempts to channel energy count as attacks if it would harm any creatures in the area. All spells that opponents resist with saving throws, that deal damage, or that otherwise harm or hamper subjects are attacks. Spells that summon monsters or other allies are not attacks because the spells themselves don't harm anyone.
Bekräfta min. Att använda Intimidate mot en fiende är ett offensivt kampalternativ, så det skulle bryta din osynlighet.