[Cthulhu_]

Depends, if you nudge it only a little, its own onboard stabilizers / thrusters should be able to correct it. It'd have to be more than its own systems can correct for.

[speed_spread]

Nudge it long enough to deplete it's fuel reserves? Or just wrap the emitting antenna in tin foil...

[sroussey]

There are tug boat style satellites now, one could grab it and force it to Earth.