alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET CURRENT_EVENTS Possible SibHost PDF Request"; flow:established,to_server; content:".pdf?p=1&s="; http_uri; fast_pattern:only; pcre:"/\.pdf\?p=1&s=[1-2]$/U"; classtype:trojan-activity; sid:2016035; rev:3; metadata:created_at 2012_12_14, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)