The pits look like impact craters, but on a low density object the penetration would be quite deep. If you notice on that image there is a much larger "crater" which has been peppered by smaller impacts, and it seems the lower portion has broken off somehow, could have been disrupted from the impact or tidal stresses later on?
I say large crater because there seems to be a central uplift, although a lot more rounded than a lunar crater.
I doubt it's a comet nucleus but it seems in this universe anything is possible......
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