Malicious PDF — malware analysis report

Static analysis result for SHA-256 af878686899ca0cd…

MALICIOUS

PDF

121.5 KB Created: 2009-09-17 09:09:59 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 0b6cc48b8ba2131fc7f6fa0faa32790a SHA-1: 362300a1c311bd5661389db2df3eccd9adbe77e6 SHA-256: af878686899ca0cd2e986934363d4b82635751ca1630e2c0410aac767f003534
108 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file was flagged by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Agent-1962), indicating malicious intent. Embedded JavaScript was detected and extracted, suggesting the document attempts to exploit a PDF vulnerability. The extracted artifact 'javascript_obj0017_000.js' is a strong indicator of a malicious script being present. The overall confidence is high due to the combination of detection signals and the presence of executable script content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-1962 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-1962
  • JavaScript action low 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.
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdfx/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
9d45ab16a054b3445110e2569f744eaa8b025d9e814acbc755f4d9db3b8358f7		 pdf-javascript-stream PDF /JS object 17 at offset 0x4DA 2703 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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