Malicious PDF — malware analysis report

Static analysis result for SHA-256 635a1814c2a51c65…

MALICIOUS

PDF

56.0 KB Created: 2009-07-11 08:11:56 Authoring application: Scribus 1.3.3.13 (via Scribus PDF Library 1.3.3.13)
MD5: 7cf5e503c2b92e1c154ec53808466d7c SHA-1: 6896a4dcf5adf23f0c89a5676606c9dbc44b7051 SHA-256: 635a1814c2a51c650a29f438cf4cb51cab9a9e294f5aeb3aa63866388ff87a9b
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Dropper.Agent-7266726-0. The JavaScript appears to be heavily obfuscated but is designed to download and execute a second-stage payload. The presence of JavaScript actions and embedded JS streams strongly indicates malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7266726-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7266726-0
  • 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 2 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/tiff/1.0/
    • http://ns.adobe.com/exif/1.0/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0034_000.js
ee87ac1ef5686c0eeabdbcc24bff6f44f5a2b1659f621cec90e716bcb32ef9f9		 pdf-javascript-stream PDF /JS object 34 at offset 0xAFBD 44132 bytes
javascript_obj0035_001.js
284dfb44946c9d2db90ac198fbeed45d2bff0a565a305d4ae0ad611ca3d1e8c1		 pdf-javascript-stream PDF /JS object 35 at offset 0xD8AE 265 bytes
javascript_obj0036_002.js
9afcd2111e7cd4d16e4f552d78c877e6284d25e5a389e74d45a9125232f66630		 pdf-javascript-stream PDF /JS object 36 at offset 0xD9CA 214 bytes

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