Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6d78e7760f0b3b6…

MALICIOUS

PDF

249.2 KB Created: 2008-10-01 23:38:02 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))
MD5: be15960379ebf2be02e7d6f62aaccd16 SHA-1: b8a7a8634486265abcc844cb36c9cf78ba24917c SHA-256: b6d78e7760f0b3b6471f652f20ab0986beb4b29199f7910d24871d58fa214885
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript that utilizes the unescape() function and targets the CVE-2007-5659 vulnerability through the Collab.collectEmailInfo method. This indicates an attempt to exploit the vulnerability to gather user information, likely for phishing or further compromise. A secondary embedded PDF was also found with similar suspicious findings.

Heuristics 7

  • 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.
  • 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/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_obj0016_000.js
65cbed720bb80ec5f4f5ddff2192c0ee32ddcf5441953b8f6489ddff827bf6ee		 pdf-javascript-stream PDF /JS object 16 at offset 0x67D 13450 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 434 eval/decoder/string-building token(s).
polyglot_child_pdf_off0003c987.pdf
6338dc5816a82778f2985a29c5b189280da8dbf420c380d399499fe3a829e748		 polyglot-child-pdf Secondary PDF body inside pdf container at offset 0x3C987 7026 bytes

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