Mr. Scratch said:"Malicious interference" in this context is a general descriptor of a variety of crimes (theft, vandalism, arson, etc.), not a single specific crime in the Washington criminal code. The general definition is:
mal·ice (mls)
n.
1. A desire to harm others or to see others suffer; extreme ill will or spite.
2. Law The intent, without just cause or reason, to commit a wrongful act that will result in harm to another.
in·ter·fer·ence (ntr-fîrns)
n.
1.
a. The act or an instance of hindering, obstructing, or impeding.
b. Something that hinders, obstructs, or impedes.
More interestingly, how would you argue that stealing someone's rightful property would NOT be considered "malicious interference"?
You don't go to plain meaning until you've examined case law. Interference & malicious interference might be two different things. All words in a statute are presumed to have meaning. By equating int. & mal. int., you give malicious no meaning. Cite a case.