Malicious PDF — malware analysis report

Static analysis result for SHA-256 f910843eff5e9c7c…

MALICIOUS

PDF

58.8 KB Created: 2008-07-02 11:22:01 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 7.0 (Windows))
MD5: 3ea1c7b7f24d9b4a95e2d2d5ad04ba0c SHA-1: 76074b19a9e3be9c001fa0a517b0ca7b9c1f5dfb SHA-256: f910843eff5e9c7cab2f92d6d05803c0c31b5e06bae4c1e344ca0b630ea4950e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript and an embedded PE payload, indicating a multi-stage attack. The critical PDF_OPENACTION and CVE_2009_4324 heuristics suggest the document is designed to exploit a vulnerability upon opening. The embedded JavaScript, identified as 'javascript_obj0016_000.js', likely facilitates the execution of the embedded PE file 'embedded_pdf_00001e73.exe', which is the primary payload.

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)
  • Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD
    PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
  • OpenAction trigger high PDF_OPENACTION
    PDF has an /OpenAction — code runs automatically when opened
  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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_obj0016_000.js
30d9b74bb61366acacae6aac180b340f25e7f910c0ab25cb3a7b65bff2b9892b		 pdf-javascript-stream PDF /JS object 16 at offset 0x300 5945 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
embedded_pdf_00001e73.exe
6960e75a853632d8fa6c84d7c23aaf8ed444ecc132a635e8e839d5b9080b387d		 embedded-pe PDF decompressed stream PE payload at offset 0x1E73 52378 bytes

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