alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT PDF Containing Windows Commands Downloaded"; flow:established,to_client; content:"%PDF-"; content:"|3C 3C 0D 0A 20 2f|type|20 2F|action|0D 0A 20 2F|s|20 2F|launch|0D 0A 20 2F|win"; distance:0; nocase; classtype:bad-unknown; sid:2011245; rev:4; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2010_07_30, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_09_27;)