Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
malicious [məˈlɪʃəs] adj (person, gossip) зло́бный*зло́бен , злой*зол (LAW) злонаме́ренный/злонаме́рен
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.