Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4831aaaa7a72028…

MALICIOUS

PDF

89.7 KB
MD5: bece7678547910e1a274f25a77a8ef8b SHA-1: 8b180d213d872f2515f3a535d3a55477fb61fd37 SHA-256: c4831aaaa7a7202814e6823a7263c2d5085a70dcd10bb772d5e0e32321a5b25c
238 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1566.002 Spearphishing via Service

This PDF file contains embedded JavaScript and exploits CVE-2009-4324 via the media.newPlayer object. The embedded JavaScript stream, which uses unescape() for obfuscation, is highly suspicious and likely responsible for initiating the exploit. A secondary embedded PDF was also found with similar suspicious static findings, indicating a multi-stage attack. The primary intent appears to be the execution of malicious code, likely to download and run a further 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-7370 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-7370
  • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0218_000.js
2ea37075bcfffeee08b257caa647ed2996d82e790ee7460379210c7ab1a24cb2		 pdf-javascript-stream PDF /JS object 218 at offset 0x549A 2156 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
polyglot_child_pdf_off00010b88.pdf
f8de0549a028ad4fcdc04b93e6e8e447e8b344e8bc12c6c174dc66cb5593fc0d		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x10B88 23403 bytes

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