ET INFO Observed Online PDF Viewer Domain (postoffice .adobe .com in TLS SNI)
Sourceet/open
CreatedSeptember 11, 2025
UpdatedSeptember 11, 2025
Classificationmisc-activity
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Online PDF Viewer Domain (postoffice .adobe .com in TLS SNI)"; flow:established,to_server; tls.sni; bsize:20; content:"postoffice.adobe.com"; fast_pattern; classtype:misc-activity; sid:2064577; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_09_11, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_11;)
Metadata
attack targetClient_Endpoint
created at2025_09_11
deploymentPerimeter
confidenceHigh
signature severityInformational
tagDescription_Generated_By_Proofpoint_Nexus
updated at2025_09_11
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