Malware
MiniJS
MiniJS is a very simple JavaScript-based first-stage backdoor.
MiniJS is a JavaScript malware family operated by Turla.
Background
MiniJS is a bare-bones first-stage backdoor written in JavaScript. It is most likely spread through spearphishing email. Overlaps in infrastructure tie the malware to the Turla actor, whose other JavaScript-based backdoors include KopiLuwak and IcedCoffee.
Source: Malpedia (Fraunhofer FKIE).