The messages that you are looking at is nothing but a debug. This output is telling you how the device is processing the packet using the Deep Inspection feature, hence such kind of messages are limited to device itself.
I was just about to change the settings when I found the following in syslog;
Apr 2 22:54:22 bluemango-21.fiberspeed.claranet.nl SSG140-BLUEMANGO-P: NetScreen device_id=SSG140- [Root]syste m-error-00601: HTTP:EXPLOIT:BRUTE-SEARCH has been detected from 220.127.116.11/60209 to 212.61.x.x/80 through policy 38 1 times. (2013-04-02 21:54:21)