Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e7dc1698cd2b346…

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: 6b1a7aa5a075a4b280f080d8d4351869 SHA-1: 56b6ba5d3859ec1c6cf26ac390864770d4dfd891 SHA-256: 2e7dc1698cd2b3468447a63126b3b6d7821cbaae9237d54ffb0e25509d28b211
156 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.001 Malicious Link

The PDF file contains embedded JavaScript, which is obfuscated and uses the unescape() function. A critical heuristic firing indicates exploitation of CVE-2007-5659 via the Collab.collectEmailInfo method. This suggests the file is designed to download and execute a second-stage payload. No document body text was available for analysis.

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)
  • 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 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
21c0beb902a23f8a5c54cbdd510541fd253980706b56cfb3e1b3071107a76d57		 pdf-javascript-stream PDF /JS object 28 at offset 0x778 2596 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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