Sniggering, Malfoy gave Harry a last malicious look and departed, with Crabbe and Goyle lumbering along in his wake.
’Ready to show us all up, Ickle Prefect?’ said Fred, emerging tousle-haired from the neck of his Quidditch robes, a slightly malicious grin on his face.
’No marks again, then, Potter,’ said Snape maliciously, emptying Harry’s cauldron with a wave of his wand.
’Yeah, Weasley, we were just wondering,’ said a malicious voice.
His pale, pointed face was alight with malice.
’Yes, yes, do,’ said Fudge, nodding, and he glanced maliciously at Dumbledore as Umbridge left the room.
Can this be?’ said Malfoy, sounding maliciously delighted; some of the Death Eaters were laughing again, and under cover of their laughter, Harry hissed to Hermione, moving his lips as little as possible, ’Smash shelves —’
There are no more uses of "malicious" in the book.
Show samples from other sources
I am not interested in hearing malicious gossip.
Words can be like baseball bats when used maliciously.