By definition malicious contact is a form of interference involving a runner and a fielder colliding (note there is no mention of a batter charging a pitcher to fight)--
2019 NFHS rule 2 SECTION 21 INTERFERENCE—OFFENSIVE, UMPIRE, SPECTATOR
ART. 1 . . . Offensive interference is an act (physical or verbal) by the team at bat:
b. when a runner creates malicious contact with any fielder, with or without the ball, in or out of the baseline.
Under NFHS rule 8-4-2c, all runners are required to attempt to avoid collisions. If a runner fails to do so, he is almost always guilty of malicious contact, which is one kind of offensive interference. Malicious contact carries the additional penalty of ejection from the game.