Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae88f6665f9cb4b…

MALICIOUS

PDF

7.8 KB Created: 2008-02-14 17:33:19 -03:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 2fe62ae6a085a653abff3bee661ed1da SHA-1: e80591f668bffdda5a4b924456b00434e2b767a6 SHA-256: aae88f6665f9cb4b56964894f7f05c7cddb46870ba232b1a7968782d93e00596
120 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript that utilizes the unescape() function and targets the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This indicates an attempt to exploit a known flaw in Adobe Reader to execute arbitrary code. No specific malware family could be identified, but the exploit vector is clear.

Heuristics 6

  • 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)
  • 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/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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0028_000.js
28ea2ecd9e86b293cc64d7a2046979e877bdd6e34c13c25a60d480498ed0289b		 pdf-javascript-stream PDF /JS object 28 at offset 0x778 2554 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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