What exact version and patch level are you on?
$> cf package list
What settings do you have under Application Defenses -> Virus Scanning?
What settings do you have in the HTTP Application Defense -> MIME/Virus/Spyware (tab) that is used in this rule?
How large are these files that start to hang? Are they archive files (zip/tar/etc.)?
Is this a physical firewall or a virtual firewall (in VMware)? If this is a physical machine, what is the model number? If this is a virtual firewall, how many CPUs/cores are dedicated to this firewall and how much memory is allocated to it?
1. The latest package list is
8.3.2P07 26-Jul-15 02:25 installed McAfee Firewall Enterprise 8.3.2P07 General Maintenance 8.3.2E49 26-Jul-15 02:35 installed McAfee Firewall Enterprise 8.3.2E49 NTP Maintenance 8.3.2E53 26-Jul-15 02:38 installed McAfee Firewall Enterprise 8.3.2E53 Timezone Maintenance 8.3.2E58 26-Jul-15 02:41 installed McAfee Firewall Enterprise 8.3.2E58 BIND Maintenance 8.3.2E55 26-Jul-15 02:50 installed McAfee Firewall Enterprise 8.3.2E55 OpenSSL Maintenance
2 & 3 . they are attached
4. Files above 145 MB start to hang when uploaded and timed out
5. This is a physical firewall - McAfee Firewall Enterprise Appliance S5032