The Collaborative International Dictionary of English v.0.48:

malicious mischief \malicious mischief\ n. (Law),
   Malicious and willful destructionof or injury to the property
   of others; -- it is an offense at common law. --Wharton.

   Syn: vandalism, hooliganism.
        [1913 Webster + WordNet 1.5]

WordNet (r) 3.0 (2006):

malicious mischief
    n 1: willful wanton and malicious destruction of the property of
         others [syn: vandalism, hooliganism, malicious
         mischief]