[SunkenCiv]

The impact delivered a great deal of energy, and there’s a lot of metal (or quartz?) in the body. The dull-looking part of the surface is covered at least a meter deep in micrometeorites and ejecta dust from larger impacts. This suggests that these craters are fairly recent, but as the age of the moon is far from agreed-upon, there’s no way to estimate an actual age for the two large craters shown.

[The Cajun]

The reason I say it looks more like a flow is because of the very low gravity on the small moon.
I think any ejecta dust/rocks from a large impact would have easily reach escape velocity and been on their way, where a molten flow might have stuck to the surface in spite of the nearly nonexistent gravity.