In The Burning Crusade it is item level 115, requires level 70 and sells to vendors for 2g 30s 68c. In Wrath of the Lich King it is item level 251, requires level 80 and sells to vendors for 2g 30s 68c. In MoP Classic it is item level 115, requires level 70 and sells to vendors for 2g 30s 68c.
Read from the World of Warcraft client build files (JournalEncounterItem, JournalEncounterCreature, Achievement) and the Blizzard Game Data quest API.
How Malefic Girdle Compares
Who It Suits
Cloth is the armor type Mage, Priest and Warlock wear. With Intellect, Malefic Girdle suits Discipline, Holy and Shadow Priest; Arcane, Fire and Frost Mage; Affliction, Demonology and Destruction Warlock.
Transmog Sets
Malefic Girdle is part of the transmog set Voidheart Raiment (Warlock only). The other 16 pieces:
Blizzard numbers items as they are created, so the named items next to ID 28654 (28647 to 28659) were usually added in the same batch as Malefic Girdle: the same quest line, zone, vendor or reward set.