Depending on your device type, I recommend installing an antivirus solution to check for possible malware. If sudden folders appear out of nowhere, then your device might be infected, therefore you have to check it. As far as I know, there are antivirus programs for Linux, Windows, and Mac operating systems. Check your OS type and then use Google to search for an antivirus solution.
There might be the possibility that the folders are created by applications installed on your computer.