Antimagic Susceptibility: The broom is incapacitated while in the area of an antimagic field. If targeted by dispel magic, the broom must succeed on a Consitution saving throw against the caster's spell save DC or fall unconscious for 1 minute. Construct Nature: The broom doesn't require air, food, drink, or sleep. The magic that animates the broom is dispelled when the construct reaches 0 hit points. A broom reduced to 0 hit points becomes inanimate and is too damaged to be of much use or value to anyone. False Appearance: While the broom remains motionless and isn't flying, it is indistinguishable from a normal broom. Flying Broom: Some brooms of animated attack allow their creators to ride them, in which case they behave like typical brooms of flying. A broom of animated attack, however, can only carry half the weight that a broom of flying can. (see chapter 7 "Treasure" of the Dungeon Master's Guide)
Mutiattack: The broom makes two melee attacks. Broomstick: Melee Weapon Attack: +5 to hit, reach 5 ft, one target. Hit: 5 1d4+3 bludgeoning damage.
Animated Attack: If the broom is motionless and a creature grabs hold of it, the broom makes a Dexterity check contested by the creature's Strength check. If the broom wins the contest, it flies out of the creature's grasp and makes a melee attack against it with advantage on the attack roll.