This thing spent 50 years in high earth orbit. Everything will have received a huge dosage of radiation along with periodic freezing and boiling temperatures.

Something may have survived, life is crazy like that, but it's unlikely it will be a dangerous pathogen to humans. In fact, surviving life will have likely adapted to eat any of the pathogens.

But also technically not impossible. For example if the dormant microbes react to prolonged microgravity and radiation in ways we don't understand, perhaps it brings back something we haven't seen before

Could be a fun science fiction plot