Malicious PDF — malware analysis report

Static analysis result for SHA-256 c703936de17cadc3…

MALICIOUS

PDF

413.4 KB Created: 2007-02-25 14:30:32 +08:00
MD5: 780124523b62a97ab04d7af1f59ea0cb SHA-1: 62258eb0581df27a729eed42762044a2724897b7 SHA-256: c703936de17cadc33d74cfe433cc90e11bd0dbd3b6610430a0d04b36f85141c7
164 Risk Score

Malware Insights

The PDF file contains embedded JavaScript and triggers the CVE-2007-5659 vulnerability via the Collab.collectEmailInfo method. This indicates an attempt to exploit a known vulnerability to gain code execution. The extracted artifact 'javascript_obj0044_000.js' further supports the presence of malicious JavaScript. The exact intent of the script is unclear due to obfuscation, but it is highly likely to download and execute a second-stage payload.

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)
  • 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 file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0044_000.js
aa4b7f0e825cb6ba105bb9b8a3064144f50e6cd47b0eef22d58d884cac72b92a		 pdf-javascript-stream PDF /JS object 44 at offset 0xF7F 3679 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).

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