The definition of "malicious" is (acc. to Google): "characterized by malice; intending or intended to do harm." The Meow bot "intended to do harm", that is, to

The definition of "malicious" is (acc. to Google): "characterized by malice; intending or intended to do harm." The Meow bot "intended to do harm", that is, to databases. Of course the creator might have had "lofty" goals and high hopes that this attack will encourage better database managers to harden their security practices in the future. But the Bot itself is definitely "malicious".