Malicious PDF — malware analysis report

Static analysis result for SHA-256 12e4158aaf3e9912…

MALICIOUS

PDF

286.6 KB Created: 2010-02-09 12:14:07 +08:00 Authoring application: Adobe Acrobat 8.0 (via Adobe Acrobat 8.0 Image Conversion Plug-in)
MD5: a7051ca423d630d9cea1af49fa1aa7e3 SHA-1: 4ae68d8ef26acf16f53a0240e31f549b46eda021 SHA-256: 12e4158aaf3e991247b80e17f018932c0e0aa9cd12326760efd06259ec18928a
214 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains embedded JavaScript that exploits CVE-2009-4324 via the media.newPlayer function. This JavaScript is likely responsible for downloading and executing a secondary payload, as indicated by the 'generic_stage_recovery' heuristic firings. The presence of a secondary embedded PDF also suggests a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

Heuristics 9

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (matched in decompressed stream)
  • 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.
  • Generic recovered JavaScript exploit stage high PDF_GENERIC_STAGE_RECOVERY
    Bounded static stage recovery exposed hidden JavaScript through generic transforms such as null-byte collapse, percent decoding, marker replacement, arithmetic character codes, fromCharCode, numeric arrays, numeric-array minus-key decoders, alphabet-index arrays, /Producer half-difference metadata arrays, hex literals, marker-stripped Base64 literals, custom 6-bit XOR table decoders, or repeated-marker hex carriers. This rule is emitted only when the recovered stage contains exploit-like Acrobat JavaScript or shellcode markers.
  • 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.
  • 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.
  • 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://ns.adobe.com/pdf/1.3/

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0024_000.js
589e82197f43a4e63c16cb710b4129d90e09077807778e07b7cd1069fb3abaa3		 pdf-javascript-stream PDF /JS object 24 at offset 0x301 4716 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
generic_stage_recovery_000.js
e42cc6b9e4b903055b0d7b0a32c4986064f75bd3964dc727c44b2ca0220d0295		 deobfuscated-js generic stage recovery split-literal-normalize from JavaScript object 24 at offset 0x301 4686 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).
generic_stage_recovery_001.js
be48d4181b13922b615e2a44849093c4056e0de1dfc73765a39f83ab7f9a8814		 deobfuscated-js generic stage recovery marker-XX-to-%u from JavaScript object 24 at offset 0x301 4694 bytes
generic_stage_recovery_002.js
874ae2d9b0df3d7229ecf37c62862f448fa80054696d3210d05f0762c44211d2		 deobfuscated-js generic stage recovery split-literal-normalize -> marker-XX-to-%u from JavaScript object 24 at offset 0x301 4664 bytes
generic_stage_recovery_003.js
be2e17b768f5e6c928ccc9b0095a7d22671b45e2f8dc703876714e6aa60b343b		 deobfuscated-js generic stage recovery split-literal-normalize -> marker-XX-to-%u from JavaScript object 24 at offset 0x301 440 bytes
generic_stage_recovery_004.js
1694bdf46d83bcf8aec17573b2c9b11aed70e1606b287d0bc31e17f9a403e085		 deobfuscated-js generic stage recovery marker-XX-to-%u -> split-literal-normalize from JavaScript object 24 at offset 0x301 4664 bytes
polyglot_child_pdf_off0001e60d.pdf
bed8b828e6ca7bf2aab91243d5aacef1465cf438b34714bb0e380ab7fe8573b5		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x1E60D 169058 bytes

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