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