Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0203b127e15aae2…

MALICIOUS

PDF

103.6 KB Created: 2009-06-06 21:05:54 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: 98a3ac00aa731176bb10e16588dac441 SHA-1: 11d209f11132bc8ddac1bf372a41bc36e84710b3 SHA-256: b0203b127e15aae2a1303791899fbb8ecc9a2367df1127acf5f9b58bff2ee989
148 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_UNESCAPE. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript, identified as stream_002_off00018753.js, is likely responsible for downloading and executing a second-stage payload, as is typical for dropper malware. The specific ClamAV detection name 'Pdf.Dropper.Agent-5343191-0' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • ClamAV: Pdf.Dropper.Agent-5343191-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-5343191-0
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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/iX/1.0/
    • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00018753.js
e169480a1b0c26b935c435e8614713183a8d2f47ef0b9169938722d3c4483638		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x18753 5798 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 19 eval/decoder/string-building token(s).

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