EDIT: I believe I found the answer, it's something turned by this: https://ctatools.com/products/5065
Found some trash on the street that i'd like to take apart, but this screw is in my way.
It's like a hex bolt, but with 5 sides, and rounded (a bit like flower petals).
Here's another picture from the top:
I tried turning it with various tools (hard to get pliars in unfortunately), no success so far. The material is very soft, which doesn't help..
Pick up the IFix it screw set, it has socket style bits that will fit that, plus most of the goofy screws in electronics, I'm a broadcast engineer and that set is awesome for work and hobby electronics work.
Edit: I just looked at their site and seems like they've grown a bit in the last ten years, they have many sets but here's a link, they definitely have what you need https://www.ifixit.com/Tools
I use the iFixit Pro kits personally and professionally: Would recommend.