alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_CLIENT Download of PDF With Compressed Flash Content"; flow:established,to_client; flowbits:set,ET.flash.pdf; flowbits:noalert; file.data; content:"stream"; content:"|0A|CWS"; within:5; fast_pattern; pcre:"/stream(\x0D\x0A|\x0A)CWS/"; reference:url,www.symantec.com/connect/blogs/analysis-zero-day-exploit-adobe-flash-and-reader; reference:url,blog.zynamics.com/2010/06/09/analyzing-the-currently-exploited-0-day-for-adobe-reader-and-adobe-flash/; classtype:misc-activity; sid:2012907; rev:6; metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2011_05_31, deployment Perimeter, signature_severity Major, tag Web_Client_Attacks, updated_at 2024_04_09;)