Malicious PDF — malware analysis report

Static analysis result for SHA-256 730212b3026845b1…

MALICIOUS

PDF

68.0 KB Created: 2010-09-20 10:36:57 +08:00 Authoring application: pdfFactory Pro (via pdfFactory Pro 3.21 (Windows XP Professional English))
MD5: 34afb0ba79f734c7e7b6ed5f187aa393 SHA-1: 39d258a5876a2dd0c3d05aa1fe6c91c0c8814f1e SHA-256: 730212b3026845b1dfba1ec9cb995ff5f951364027a7dfdb0584ec8debefd96e
204 Risk Score

Malware Insights

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

The PDF exhibits multiple critical heuristic firings related to embedded child PDFs and suspicious static findings, indicating a high likelihood of malicious intent. The ML classifier also flagged it with a high score. The presence of embedded files and rich media suggests it's designed to deliver or execute further malicious content, potentially exploiting vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 7

  • Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE
    PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
  • 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.
  • 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)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 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.
  • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00001675.bin
cd2e9a4b7495246deba26261b394c05829a066fde2ab2bb32c13b02e7d1cd1d7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1675 36407 bytes
objstm_0017_00.bin
c515a5551a72a8497045fc7510d95c5a1a4edc56f02c0e8a1e04fb3285830168		 pdf-objstm-decoded PDF /ObjStm 17 0 obj (inflated) 1038 bytes
polyglot_child_pdf_off0000eefe.pdf
bdeff33dd834e1bf5a1766c43883f6e833b9fc1242744c5d8e21dbe6513443c7		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xEEFE 8419 bytes
polyglot_child_pdf_off0000f7f4.pdf
4b16dada1ca3275de53ef776759c2486baa73e7c85f2f3490d9ca38a9466d91f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0xF7F4 6125 bytes

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