Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8ec66693d56eeb9…

MALICIOUS

PDF

259.5 KB
MD5: 87aac22f22f107570c87ef99ec34ce88 SHA-1: c4597b2b3dac44ad5ff0aab3154bbdd2acde9451 SHA-256: a8ec66693d56eeb908f8278c2b7395fac35bb530daccfeaba3fd673cea47484a
280 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript that utilizes the unescape() function and exploits CVE-2009-4324 via the media.newPlayer object. This script is designed to download and execute a Windows executable payload (Win.Trojan.Agent-727198) found embedded within the PDF. The embedded executable is the primary malicious artifact, and the PDF serves as a delivery mechanism exploiting known vulnerabilities.

Heuristics 10

  • 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. 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.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
781b674cb9a57a32740060f878857c5c60e4b651ae3f1138ad3b8568cfdfe777		 embedded-pe PDF decompressed stream PE payload at offset 0x1DCE 258047 bytes
Detection
ClamAV: Win.Trojan.Agent-727198
Obfuscation or payload: unlikely
polyglot_child_pdf_off0003ddd2.pdf
2625c0afd6ec976d570eb0e31b0d73b85956e8939d6264cf51a5f49fd5822d2f		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3DDD2 12287 bytes

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