Malicious PDF — malware analysis report

Static analysis result for SHA-256 77df38a24f93c909…

MALICIOUS

PDF

236.0 KB Created: 2010-07-02 08:58:56 -07:00
MD5: 9779fb44f49795dba8bc12e721c1fe15 SHA-1: 00655a6441a66d4d70135849d855493005162b19 SHA-256: 77df38a24f93c9092a50550a89bca9856e6da087d7cd808b5a35cf2c05fdcfc5
158 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Win.Trojan.Agent-36159 and the ML classifier indicated a high probability of maliciousness. Heuristics indicate the presence of embedded JavaScript, a RichMedia (Flash) object, and an embedded file, all within a decoded stream. These components suggest the PDF is designed to execute code, likely to download and run a secondary stage payload. The benign URLs present do not detract from the malicious indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8665

Heuristics 7

  • ClamAV: Win.Trojan.Agent-36159 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Agent-36159
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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. (matched inside decoded stream)
  • 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. (matched inside decoded stream)
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload (matched inside decoded stream)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • 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/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0035_00.bin
52bd955d0fa873e8d711320d6f487289717adf877fdd263a36eedac4537e03e9		 pdf-objstm-decoded PDF /ObjStm 35 0 obj (inflated) 1993 bytes

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