Malicious PDF — malware analysis report

Static analysis result for SHA-256 846f2917a80b89ef…

MALICIOUS

PDF

104.1 KB
MD5: b18dc2842dbeb94fd48b725343e4fa69 SHA-1: 8a5c4c37de6a0350739da7fc7d6f9a36575c830f SHA-256: 846f2917a80b89ef1adfa991fd9637aad52b86ec128201b187a41c64c35af4bf
330 Risk Score

Malware Insights

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

The PDF file contains obfuscated JavaScript and exploits known vulnerabilities (CVE-2009-4324, CVE-2008-2992) to achieve code execution. The JavaScript is heavily obfuscated, but its structure suggests it is designed to download and execute a second-stage payload. The presence of multiple PDF-specific heuristics and a high ML score further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6911

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)
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure. (matched in decompressed stream)
  • Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT
    A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • 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
javascript_obj0006_000.js
70dd0b8efe2b0d10a75783905da2736c6e70e9564bccaa5235dae35c3eafc54c		 pdf-javascript-stream PDF /JS object 6 at offset 0x18B 6603 bytes
stream_007_off00017496.bin
3b659ce327ca539f4a92697b75f2362a36751743b0cf1c8334eae877c2e948c8		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17496 2843 bytes
polyglot_child_pdf_off00016156.pdf
ab93e2f8f423c3ba7034ba698a37060931ecb38484840e29cd278ffabe46308d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x16156 16122 bytes

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