Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1611b9b84581e87…

MALICIOUS

PDF

81.2 KB Created: 2009-07-17 18:58:01 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)
MD5: a7907b1720a44eeb005a0ec5629555cc SHA-1: 2c6811c2ae310271ed610b63276fe79728fd02e5 SHA-256: f1611b9b84581e87ac4f4490069870700321b917c358959965b5d8659dc57d1f
108 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' and 'PDF_JS'. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, along with the ClamAV signature 'Pdf.Dropper.Agent-7322665-0', confirm its malicious nature. The embedded JavaScript is the primary mechanism for delivering the malicious payload, likely involving downloading and executing further stages. The PDF itself appears to be a lure, as indicated by the 'PDF_IMAGE_ONLY_LURE' heuristic, suggesting it contains no readable text content and relies on its structure or embedded scripts to initiate the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7322665-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7322665-0
  • 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.
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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://ns.adobe.com/xap/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/sType/ResourceRef#
    • http://ns.adobe.com/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0015_000.js
3d1c9a629c83c583523e69bf93f7eb1dfbc9160b316cfe7f57c24680b6cd46b8		 pdf-javascript-stream PDF /JS object 15 at offset 0x115FE 44421 bytes
javascript_obj0016_001.js
43800ec3a49ad9f2e913264718b8aa62bc7d5c9ee1374fd01c3f27c5b29db427		 pdf-javascript-stream PDF /JS object 16 at offset 0x13EE0 284 bytes
javascript_obj0017_002.js
cc8d30a68110475771f6903dab70308290b173a8c0558e9b66ed32bf9ddddb52		 pdf-javascript-stream PDF /JS object 17 at offset 0x1400A 242 bytes

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