I've tried different methods to super enhance Pluto's moon Hydra, & also applied different filters to bring out different details. No matter which way I try to enhance it, unlike the original NASA photo, it does not look like a rock, but a constructed object.
Some of the uneven or bumpy lines could be the results of the image blurring or distorting at this high magnification as our probe zooms by. That's why the lines & bumps look slightly different depending on what filters or enhancements I used. One could also imagine that a constructed object in orbit for thousands or millions of years would be a little twisted, dented, or distorted over the eons of time too.
But clearly this does not look like just a rock in space. It has obvious structure to it.