Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2720318c0c3ead…

MALICIOUS

PDF

104.8 KB Created: 2008-05-21 16:10:52 +08:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0 (Windows))
MD5: 3fd0b0f71b105b3d115fedfc63ba6254 SHA-1: 7fa58f502c9d7f61705cd3ba5e6266655cd3f39f SHA-256: db2720318c0c3eada774c7533e1c663c80a653ae990a4b3ab34fd93ce387e680
352 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript and exploits the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. A secondary embedded PDF was also found with similar suspicious findings. The primary JavaScript stream, stream_004_off00000ad5.js, uses unescape() and is heavily obfuscated, indicating it likely downloads and executes a second-stage payload. ClamAV detection as Pdf.Exploit.Agent-35908 further confirms its malicious nature.

Heuristics 11

  • Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659
    PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (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-35908 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35908
  • 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)
  • Suspicious extracted artifact high 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.
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/pdfx/1.3/
    • http://ns.adobe.com/photoshop/1.0/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://purl.org/dc/elements/1.1/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0026_000.js
afcec710789160d07f5a348e6180abd67058a5d7777b0b776126d991ba37c196		 pdf-javascript-stream PDF /JS object 26 at offset 0xA9E 1152 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35908
Obfuscation or payload: unlikely
stream_004_off00000ad5.js
daa30e3bb075b650c7e10ec3bd2a26302bb701ac90ceba112d5c347128f520ca		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xAD5 3308 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 eval/decoder/string-building token(s).
polyglot_child_pdf_off00012114.pdf
e11067346ef57183d275c56c6a63339264540313d2c07e100480dad4d2c102a4		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x12114 33263 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35908
Obfuscation or payload: unlikely

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