The class file type is mainly associated with Java, Sun Microsystems, Inc., and with the following MIME types: application/octet-stream, application/x-java, application/java-byte-code, application/x-java-class, application/x-java-vm, application/x-java-bean, application/x-jinit-bean, application/x-jinit-applet

This SonicWALL signature identifies HTTP downloads of Content-Type: application/x-java-vm.