https://www.juniper.net/documentation/us/en/software/junos/utm/topics/concept/utm-web-filtering-overview.html

Only static NAT with pool ensures both traffic initiated from inside and outside networks use the same IP address.

Juniper Advanced Threat Prevention (ATP) Cloud is a security service that helps organizations protect against advanced threats by providing real-time threat intelligence and automated response capabilities. It combines a cloud-based threat intelligence platform with the security capabilities of Juniper Networks security devices to provide comprehensive protection against advanced threats. The two functions of Juniper ATP Cloud include malware inspection and Geo IP feeds. The malware inspection component provides real-time protection against known and unknown threats by analyzing suspicious files and determining if they are malicious. The Geo IP feeds provide a global view of IP addresses and their associated countries, allowing organizations to identify and block traffic from known malicious countries.

user@host# set security utm custom-objects url-pattern url-pattern-name https://www.juniper.net/documentation/us/en/software/junos/utm/topics/topic-map/security-local-list-antispam-filtering.html