This article provides the existing documentation related to UTM MIB and UTM SNMP objects.
N/A.
UTM MIB is jnxJsUTMRoot, OID = 1.3.6.1.4.1.2636.3.39.1.13
It is part of the jnxJsSecurity MIB node.
References of both UTM and Security MIB can be found here (this example is using the 21.4R3 release):
https://apps.juniper.net/mib-explorer/navigate?software=Junos%20OS&release=21.4R3&name=jnxJsUTMRoot&oid=1.3.6.1.4.1.2636.3.39.1.13
https://apps.juniper.net/mib-explorer/getMibFile/Junos-OS/21.4R3/mib-jnx-js-smi.txt