If I’m getting this right we would be wise to send a survey probe up to the one that’s potentially harmful and if we can’t seem to detect if there’s any minerals or elements on it worth harvesting and if matching its’ orbit is even an option, the next thing to do would be to either mine it or collide with it to push it off course. At the very least before Kessler syndrome kicks in and locking ourselves out of near-earth orbital access. Until then, another wake up call to remind us that we need to be mindful of what’s out there.