ATM skimmers and other frauds are still around in Indonesia so, if you see something unusual, don't use the machine.
Supermarkets and such places are usually fine as the places have 24 hour security but outside machines are prone to thieves.
I noticed this one this morning so I didn't use it just in case, but I have reported it to BNI.
It isn't absolutely a skimmer but there was no way I was using a machine that looked off, just in case.