Malicious PDF — malware analysis report

Static analysis result for SHA-256 743ea166b7363082…

MALICIOUS

PDF

176.7 KB Created: 2008-06-11 09:27:12 -07:00 Authoring application: Acrobat PDFMaker 6.0 for Word (via Acrobat Distiller 6.0.1 (Windows))
MD5: 6f352f95f3335e6fc40fa9caa8d7534d SHA-1: 47b33afe6b00c114b5ec1824fb6b98c64d416f0f SHA-256: 743ea166b7363082db3693136f5ef6a12c8fdb60e0d1f10c7ec6c3d523b4a064
390 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file contains embedded JavaScript that leverages the CVE-2007-5659 vulnerability (Collab.collectEmailInfo) to execute arbitrary code. The JavaScript is obfuscated using unescape() and appears to be designed to download and execute a secondary payload, as indicated by the 'PDF JavaScript exploit cluster' and 'POLYGLOT_CHILD_PDF_STATIC_TRIAGE' heuristics. ClamAV also detected this as Pdf.Exploit.Agent-35909.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 10

  • 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)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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-35909 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-35909
  • 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)
  • 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/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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0030_000.js
9bdbfa5df6f827ff63cd61e1f8d58420b7f4b59844725102d812651a2abe8b1e		 pdf-javascript-stream PDF /JS object 30 at offset 0x841 3404 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 17 eval/decoder/string-building token(s).
polyglot_child_pdf_off0002a0ef.pdf
6cb19303fc6b16a6f579f01ff215e6a9826ab03d888dc2cc485579b8212a1843		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x2A0EF 8710 bytes
Detection
ClamAV: Pdf.Exploit.Agent-35909
Obfuscation or payload: unlikely

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