alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET POLICY PDF File Containing Javascript"; flow:established,to_client; content:"obj"; content:"<<"; within:4; content:"/JavaScript"; nocase; distance:0; pcre:"/\x3C\x3C[^>]*\x2FJavaScript/smi"; threshold:type limit, count 1, seconds 60, track by_src; classtype:misc-activity; sid:2010882; rev:8; metadata:created_at 2010_07_30, confidence High, signature_severity Informational, updated_at 2019_07_26;)