Malicious Office (OLE) — malware analysis report

Static analysis result for SHA-256 e6da63e377ae8cc5…

MALICIOUS

Office (OLE)

1000.0 KB Created: 2010-03-24 03:48:00 Authoring application: Microsoft Word 12.0.0
MD5: 2b353f5191ae593fe4f93692061c2d98 SHA-1: 8f5fc97564e67a2174ad3ca917b0a4fb1d6138b0 SHA-256: e6da63e377ae8cc54e8eafe0344ac3cfd5b4a7fe5a7ed9f52e4e3a2b740e6e7d
418 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1204.001 Malicious Link T1059.001 PowerShell T1059.005 Visual Basic T1059.007 JavaScript

The sample is a polyglot file containing an embedded PDF that exploits multiple Adobe Reader vulnerabilities, including CVE-2009-0927 (Collab.getIcon), CVE-2007-5659 (Collab.collectEmailInfo), and CVE-2008-2992 (util.printf stack buffer overflow). The embedded PDF contains JavaScript with eval() and unescape() calls, indicating it's designed to download and execute a second-stage payload. The document body describes social engineering attacks using malicious PDF files to lure victims, aligning with the exploitation techniques.

Heuristics 12

  • Collab.getIcon — CVE-2009-0927 critical CVE exact CVE_2009_0927
    PDF JavaScript calls Collab.getIcon — CVE-2009-0927 is a stack buffer overflow in Adobe Reader triggered by Collab.getIcon() with a crafted argument. Allows arbitrary code execution.
  • 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.
  • util.printf — CVE-2008-2992 critical CVE exact CVE_2008_2992
    PDF JavaScript calls util.printf() — CVE-2008-2992 is a stack buffer overflow in Adobe Reader triggered by a long format-specifier argument. Widely exploited in the wild after disclosure.
  • 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 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.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution
  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.
  • 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://milw0rm.com/sploits/2008-APSB08-19.pdf
    • http://libemu.carnivore.it/
    • http://www.accesspdf.com/pdftk/
    • http://www.didierstevens.com/files/software/js-1.7.0-mod.tar.gz
    • http://blog.didierstevens.com/programs/spidermonkey/
    • http://www.mycert.org.my/en/services/advisories/mycert/2010/main/detail/723/index.html
    • http://www.coresecurity.com/content/adobe-reader-buffer-overflow
    • http://skypher.com/wiki/index.php/Hacking/Heap_spraying
    • http://www.adobe.com/devnet/acrobat/pdfs/pdf_reference_1-7.pdf
    • http://get.adobe.com/reader/
    • http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0007_000.js
f939c127bf458274ad8860d1126fce78969f73921b816d51662d5ae9cac9c400		 pdf-javascript-stream PDF /JS object 7 at offset 0x91D8 96 bytes
polyglot_child_pdf_off00001d6e.pdf
cc03b579251c82e20ea7042d22f8eba890669045f5316eae6fcab168d3c041fe		 polyglot-child-pdf Secondary PDF body inside ole container at offset 0x1D6E 1016466 bytes
Detection
ClamAV: Pdf.Exploit.CVE_2009_0927-1
Obfuscation or payload: likely
Carved artifact contains 12 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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