The Limits section allows you to specify the maximum size of objects and levels of nested archives to be scanned:
Maximum object size (bytes)
Defines the maximum size of objects to be scanned. The given antivirus module will then scan only objects smaller than the size specified. We do not recommend changing the default value, as there is usually no reason to modify it. This option should only be changed by advanced users who may have specific reasons for excluding larger objects from scanning.
Maximum scan time for object (sec.)
Defines the maximum time value for scanning of an object. If a user-defined value has been entered here, the antivirus module will stop scanning an object when that time has elapsed, regardless of whether the scan has finished. This setting is related to archive scanning.
Archive nesting level
Specifies the maximum depth of archive scanning. We do not recommend changing the default value of 10; under normal circumstances, there should be no reason to modify it. If scanning is prematurely terminated due to the number of nested archives, the archive will remain unchecked.
Maximum size of file in archive (bytes)
This option allows you to specify the maximum file size for files contained in archives (when they are extracted) that are to be scanned. If scanning of an archive is prematurely terminated for that reason, the archive will remain unchecked.