Pdf.Dropper.Agent-7224775-0 — PDF malware analysis

Static analysis result for SHA-256 0684c8c6e58f013e…

MALICIOUS

PDF

83.7 KB Created: 2011-04-25 22:48:14 +08:00 Authoring application: Writer (via OpenOffice.org 3.0)
MD5: 631e5a090f837824cdc73a1506c6a9c3 SHA-1: f79966d15b1b3c2ac055b94cf2dbe9217c670b8f SHA-256: 0684c8c6e58f013eccbe8005491cf0d1fb40474be1195d95fcad9e9c035775a4
202 Risk Score

Malware Insights

Pdf.Dropper.Agent-7224775-0 · confidence 95%

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

This PDF file was flagged by multiple high-severity heuristics, including ML classification and ClamAV detection, identifying it as a dropper. It contains embedded files, including secondary PDFs, which are strong indicators of a multi-stage attack. The presence of these embedded artifacts suggests the primary PDF is designed to exploit vulnerabilities or facilitate the execution of further malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

Heuristics 6

  • Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE
    A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
  • ClamAV: Pdf.Dropper.Agent-7224775-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7224775-0
  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector (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)
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objstm_0026_00.bin
a857974669b840d75523cf076c96d626e5e0fa5284200c320ba77d68058c256a		 pdf-objstm-decoded PDF /ObjStm 26 0 obj (inflated) 1061 bytes
polyglot_child_pdf_off0000ad67.pdf
c442b9fea81411f321f970ce966df8b2738b2d698b948882f530d6b863469a63		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xAD67 41281 bytes
polyglot_child_pdf_off000136bb.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x136BB 6125 bytes

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