Malicious PDF — malware analysis report

Static analysis result for SHA-256 4df4a33ea9003fe9…

MALICIOUS

PDF

262.0 KB Created: 2010-04-21 00:46:53 +08:00
MD5: 0f8120ca3e9f2ebf90f977c02296e5b9 SHA-1: ab172c4f3d85bb9dbc9d9c22127db064f094598e SHA-256: 4df4a33ea9003fe96dff31ea70d20d9be38b079a21a99733576708b97d61a6c4
126 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and a Flash object, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. The ClamAV detection of 'Pdf.Exploit.Agent-35956' strongly suggests it's a known exploit. The embedded JavaScript is likely responsible for downloading and executing a secondary payload, which is a common attack vector for PDF-based malware. The presence of numerous benign URLs does not detract from the malicious nature indicated by the exploit and embedded content.

Heuristics 7

  • ClamAV: Pdf.Exploit.Agent-35956 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35956
  • 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/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/
    • http://www.w3.org/1999/02/22-rdf-syntax#
    • http://ns.adobe.com/xap/1.2/
    • http://purl.org/dc/elements/1.2/
    • http://ns.adobe.com/xap/1.0/mn/
    • http://ns.adobe.com/pdf/2.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0015_00.bin
0bea2f3f6742827130b057b701b07bdcb51c89b49c3509980c44a0392473f8fb		 pdf-objstm-decoded PDF /ObjStm 15 0 obj (inflated) 888 bytes

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