alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE APT_NGO_wuaclt PDF file"; flow:from_server,established; file_data; content:"%PDF-"; within:5; content:"|3C 21 2D 2D 0D 0A 63 57 4B 51 6D 5A 6C 61 56 56 56 56 56 56 56 56 56 56 56 56 56 63 77 53 64 63 6A 4B 7A 38 35 6D 37 4A 56 6D 37 4A 46 78 6B 5A 6D 5A 6D 52 44 63 5A 58 41 73 6D 5A 6D 5A 7A 42 4A 31 79 73 2F 4F 0D 0A|"; within:200; reference:url,labs.alienvault.com/labs/index.php/2013/latest-adobe-pdf-exploit-used-to-target-uyghur-and-tibetan-activists/; classtype:targeted-activity; sid:2016579; rev:2; metadata:created_at 2013_03_15, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)