Hard to say. If they look like a strange language or code, either they are encrypted/encoded file names or SPAM.
Many groups have been hit by idiots spamming.
Not much can be done as no one to report it to other than your news provider, but very rarely now do they do much.
It can come from so many providers, the people get cheap block accounts and can upload all they want.
If it's one poster, lock out the poster in NewsBinPro. Or try variations of NewsBinPro filters to filter the 'junk' out.
With 90,855,907 post count, and counting, I am not up to loading the group.
Also see this >
https://forums.newsbin.com/viewtopic.php?f=5&t=48342