Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4a27e9e60ba4119…

MALICIOUS

PDF

260.8 KB
MD5: 8f42ebad1d1a718d67b541e70683b51c SHA-1: 5c73df6de50adf0cfc43f82c4d72b8edab4c9a4c SHA-256: b4a27e9e60ba411913c124fae328dadac121b1552581968e0659f1a8c1b2529f
278 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The PDF contains embedded JavaScript and exploits CVE-2009-4324 (media.newPlayer) to execute a secondary payload. This secondary payload is an embedded PE file detected by ClamAV as Win.Trojan.Agent-727198. The sample also contains suspicious URLs, one of which is a potential command and control server. The combination of PDF exploitation, embedded executable, and suspicious network indicators strongly suggests a malicious delivery mechanism.

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.
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • 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.
  • 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.asiahsbcbank.com:81/wjf/IPconfig
    • http://%s:%d/%d%s
    • 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_obj0016_000.js
30d9b74bb61366acacae6aac180b340f25e7f910c0ab25cb3a7b65bff2b9892b		 pdf-javascript-stream PDF /JS object 16 at offset 0x2EB 5945 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).
stream_015_off0003e668.bin
ffcb1ad71985ef16cca81ebc3c88fc9c01fb1d425a9d490a1b6fb25db3ba67ff		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3E668 5069 bytes
embedded_pdf_00001dce.exe
d138cbad21e0f174f3d1faf61549ea8f192ae3cf0ab92adb790ffc45dc1cb4c3		 embedded-pe PDF decompressed stream PE payload at offset 0x1DCE 259470 bytes
Detection
ClamAV: Win.Trojan.Agent-727198
Obfuscation or payload: unlikely
polyglot_child_pdf_off0003ddd2.pdf
a486d38c33c2f19de786424830fb41bf73b125dae6bf207d3c130abd69b07a83		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3DDD2 13710 bytes

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