Malicious PDF — malware analysis report

Static analysis result for SHA-256 09b4bbb0eb1a043e…

MALICIOUS

PDF

449.4 KB Created: 2009-08-06 08:45:36 -03:00 Authoring application: Acrobat 编辑器 8.0 (via Adobe Acrobat 8.0)
MD5: 18eb59004bc1998d4968e142fd1107bd SHA-1: b36ea140bc22e441a04630b04a1a65a1634442d4 SHA-256: 09b4bbb0eb1a043ea57f7d872356c595384b917fc27a1697fe6da34dcdca30a0
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript that is heavily obfuscated but appears to be designed to download and execute a secondary payload. The ML classifier strongly indicates maliciousness, and the presence of embedded files and JavaScript actions further supports this. The primary attack vector is likely spearphishing, with the PDF acting as an attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 8

  • RichMedia (Flash) high PDF_RICHMEDIA
    PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
  • Secondary embedded PDF body has suspicious static findings high 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.
  • 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.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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.
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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://adobe.com/AS3/2006/builtin
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
opening_animation.swf
917b58b57f117c208dbdbb38b9675db5d304a168912a042ce346da196cb89439		 pdf-embedded-file PDF EmbeddedFile object 29 at offset 0x567CE 1165 bytes
javascript_obj0034_000.js
64273ec2489853bda15daef0c125290188ba1ddfee3161c3b00c3888c70a4f30		 pdf-javascript-stream PDF /JS object 34 at offset 0x56F59 8192 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
polyglot_child_pdf_off0006c656.pdf
93de7b53c4b40efaaddf2289f27d26eeb6e81c5110a1f4bd8c1bc5169000bbf4		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x6C656 16191 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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