Missiles which may come down in a multiple thousand square mile area(if lucky) are generally not considered useful.
They aren't that dangerous on the ground due to the reentry process but there are busses out there that could be guided into the ISS if the attacker knew what they were doing.
I'm sure some modern reincarnation of terrorists would be interested.
Does it have enough propellant to deorbit?
A GEO one, no chance. It will have enough to change out of GEO to a graveyard orbit, which means it will have enough to shift its position in GEO and collide with another satelite.
LEO sure, you don't need to adjust your perigee or even your angle of attack much to change orbit. But then very little from a satellite will reach the ground.