Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d5edb607a425b8e…

MALICIOUS

PDF

279.2 KB Created: 2010-11-12 16:05:24 +08:00 Authoring application: Writer (via OpenOffice.org 3.0)
MD5: a79a6e748bacba3aedbf2faeef27bf2a SHA-1: 0e9f26bf7ff09d9c0073c297c440fac7c32ff608 SHA-256: 5d5edb607a425b8ee8f949b07ecf5bce7f70cd1aab854922d6fed2805db56117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1559.001 Component Object Model

The PDF contains embedded JavaScript and a Flash object, indicated by the PDF_JAVASCRIPT, PDF_JS, and PDF_RICHMEDIA heuristics. The ML classifier also flagged it as malicious. The presence of embedded PDFs suggests a multi-stage attack. The primary PDF likely serves as a container for further malicious content, potentially exploiting vulnerabilities in PDF viewers or Flash players.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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)
  • 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 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.
  • 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_0027_00.bin
667b2c75ccf7ac530ab7ab1335ed88701c878c9bd33ce7626a853b18be32e7d1		 pdf-objstm-decoded PDF /ObjStm 27 0 obj (inflated) 1170 bytes
polyglot_child_pdf_off00044069.pdf
fe1583c05ef0f6ed7c71670ad19cd2a07df15d70ab1eb8a466454eab6eb1f527		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x44069 7293 bytes
polyglot_child_pdf_off000444f9.pdf
0b1c923c8a0028794f3a3244dc498786746334f394e41678cc58ffbeb707d0a8		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x444F9 6125 bytes

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