Malicious PDF — malware analysis report

Static analysis result for SHA-256 18f044aa139c87bd…

MALICIOUS

PDF

96.7 KB Created: 2009-06-26 16:25:57 +08:00 Authoring application: Acrobat PDFMaker 7.0 for Word (via Acrobat Distiller 7.0 (Windows))
MD5: 45bfe685faaf696fed32606fac2787b5 SHA-1: f14aa87431def2a854214193797367371c4c2fe0 SHA-256: 18f044aa139c87bdb6e65e3425b2435eb765d16ba7d96b0e6cbd75b6dbf8cdee
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, specifically identified as Pdf.Exploit.Agent-13717. It contains embedded JavaScript, which is obfuscated and likely intended to exploit a vulnerability for client execution. The primary function appears to be downloading and executing a secondary payload, a common tactic for malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Exploit.Agent-13717 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-13717
  • 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/pdfx/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0048_000.js
115bc9e664e7313809b4fa42d6d614daab6059afdb04239821322c24273dc17c		 pdf-javascript-stream PDF /JS object 48 at offset 0x50B 3668 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).

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