Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c06d728ec974581…

MALICIOUS

PDF

226.6 KB Created: 2009-06-06 21:05:54 +08:00 Authoring application: Acrobat Distiller 7.0 (Windows)
MD5: b2973aafb3ce1aeb640e52bd204300f2 SHA-1: 37555a25a28abd13f76cc2cb96d59f7cbcd7147d SHA-256: 1c06d728ec9745813ac1f48963956b05861f5783bf2c7ec15c9315abdadb966f
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The ML classifier also flagged the PDF as malicious with a high probability. The extracted JavaScript file, 'javascript_obj0017_000.js', is likely responsible for downloading and executing a second-stage payload, a common technique for malware delivery. However, the exact nature of the payload and the specific URLs used for download could not be determined due to obfuscation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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/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
b27832c2b4d1bde0d739bb47befc664a0bf9749f03cff2732212758c3e6b2e8b		 pdf-javascript-stream PDF /JS object 17 at offset 0x4D8 5090 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 22 eval/decoder/string-building token(s).

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