Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb2183d17f47f019…

MALICIOUS

PDF

211.6 KB Created: 2009-07-28 12:46:19 +08:00 Authoring application: Acrobat PDFMaker 9.0 Word 版 (via Adobe PDF Library 9.0)
MD5: c2ae8830e767e268e8d21799d4df0bba SHA-1: d52e21c790db5e058be9b1d12dfc3dd2676be80c SHA-256: cb2183d17f47f019cf0625d8c2826c351427a0540a7e8eba6145e795f71c5ff0
112 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV with the signature 'Pdf.Dropper.Agent-7304192-0'. Static analysis revealed embedded Flash content (b.swf, a.swf) and a PDF image-only lure, suggesting an attempt to disguise malicious activity. The presence of embedded files and the ClamAV detection strongly indicate a dropper or exploit delivery mechanism.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4707

Heuristics 5

  • ClamAV: Pdf.Dropper.Agent-7304192-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7304192-0
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://adobe.com/AS3/2006/builtin

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
b.swf
70e6dbce3b11aaece2d38f1d315dee7736c7ab9138a74cdadc8126393c857018		 pdf-embedded-file PDF EmbeddedFile object 2 at offset 0x33317 781 bytes
a.swf
257b38b73bb7bcfdd2a38ddeda0673fef573372a42e34e3d1f33e49435d5ef32		 pdf-embedded-file PDF EmbeddedFile object 3 at offset 0x33654 8038 bytes
icc_00_off000302b1.icc
653b586c4707574ffcd648ba35494daed2c76ceafcf4c07d315ed961b1dc347f		 pdf-icc-profile PDF ICC profile at offset 0x302B1 408 bytes
font_00_sfnt_off000303de.bin
5bae21d6090f59a30136388865be4af1db24de6e621999b893f7c87caa7c43c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x303DE 26096 bytes

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