alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET INFO PDF /FlateDecode and PDF version 1.0"; flow:established,from_server; file_data; content:"%PDF-1.0"; fast_pattern; within:8; content:"/FlateDecode"; distance:0; classtype:misc-activity; sid:2015954; rev:3; metadata:attack_target Client_Endpoint, created_at 2012_11_29, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2023_04_20;)