Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a3cea82c3c53471…

MALICIOUS

PDF

225.1 KB
MD5: a8bbe87f75754945f64098567f5500f7 SHA-1: 9ed3220eaea2a0898599c7d7cd602cb253faff2b SHA-256: 8a3cea82c3c534719ff0d96fe8deebde8f36e303de75b1c88e163c4379833e3d
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The PDF file contains embedded JavaScript and triggers a critical vulnerability (CVE-2009-4324) related to media player handling. A secondary embedded PDF was also found with similar suspicious findings, including JavaScript execution and unescape calls. The embedded JavaScript stream, named 'javascript_obj0057_000.js', is likely responsible for the malicious activity, potentially downloading and executing a second-stage payload.

Heuristics 8

  • 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.
  • ClamAV: Pdf.Exploit.Agent-21021 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-21021
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (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.
  • 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.
  • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0057_000.js
eae10c2d1846ed108dbd322fa8001738199732b4fe8b3355e360a1f3532eb5fd		 pdf-javascript-stream PDF /JS object 57 at offset 0x551F 2102 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s). Carved artifact contains 1 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_off0003186c.pdf
0d923bee61e46570e596c3e475893b7423d040db700e07ef329458a841470f1d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3186C 27598 bytes

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