Malicious PDF — malware analysis report

Static analysis result for SHA-256 4146da5f06eaa1c4…

MALICIOUS

PDF

94.1 KB
MD5: 3a5495ce94fea6f38d18e1d7f534c048 SHA-1: f3708d35d7041e8d4cc57899965354c412d3a581 SHA-256: 4146da5f06eaa1c4d3cdc870a4914e612249003d0d9de2a495b178e7664ffe6b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

This PDF file contains embedded JavaScript and exploits the CVE-2009-4324 vulnerability via the media.newPlayer object. The presence of a secondary embedded PDF with similar suspicious findings, including JavaScript and unescape calls, indicates a multi-stage attack. The primary function appears to be leveraging this exploit to execute malicious code.

Heuristics 7

  • 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.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • Suspicious extracted artifact medium 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.
  • 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 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0052_000.js
45fea71ee6347153ec3719ebc3910509cd6fa568f263c29e7474c694308f5c7d		 pdf-javascript-stream PDF /JS object 52 at offset 0x3F4E 301 bytes
javascript_obj0057_001.js
86821d7edcc8142fc94d3635e99ccf3c8781bfa43bd3ee98de9716f6ee24a490		 pdf-javascript-stream PDF /JS object 57 at offset 0x5500 2523 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
stream_005_off00000b74.bin
e4217c167299ac63f64b8b7e903cc0196f0828693d273431b8b793a12ed0fed3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB74 1000 bytes
objstm_0053_00.bin
f9797d0fa28384c30d8bf1da89163104ce539753e417fa1f9c5fd135d1eceb39		 pdf-objstm-decoded PDF /ObjStm 53 0 obj (inflated) 50 bytes
polyglot_child_pdf_off00010c2d.pdf
aea7babb5d0a42bd71263f34becb9e2a6501e986ba507522b6c92eb6c1a0821d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x10C2D 27691 bytes

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