new obsfucation method in the last couple days?

Is there a new obsfucation method that started in the last couple days?
Some .nzb's I've been getting are being decoded as 4 random characters with the correct extension.
I can provide a nzb if you need one to look at
Some .nzb's I've been getting are being decoded as 4 random characters with the correct extension.
I can provide a nzb if you need one to look at