Malicious PDF — malware analysis report

Static analysis result for SHA-256 5080fe04cdd5d78b…

MALICIOUS

PDF

351.0 KB Created: 2008-03-03 17:06:00 UTC Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))
MD5: 079100d681501e7d66fd805b9f41336d SHA-1: c06d36fc1ae305ac2aa444f6aea289dc69097060 SHA-256: 5080fe04cdd5d78be4d89bc5e38ac20d4dbdeb7bb997f390798ba517bff28a0a
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File T1071.001 Web Protocols

The PDF sample contains embedded JavaScript that utilizes String.fromCharCode and exploits known vulnerabilities (CVE-2009-4324 and CVE-2007-5659) via the media.newPlayer and Collab.collectEmailInfo functions. The JavaScript is obfuscated but appears to be designed to download and execute a secondary payload from the unknown URL http://www.pdf-repair.com. The presence of multiple PDF-specific heuristics and the exploitation of known CVEs strongly indicate a malicious intent.

Heuristics 9

  • media.newPlayer — CVE-2009-4324 critical CVE exact CVE_2009_4324
    PDF JavaScript calls media.newPlayer — CVE-2009-4324 is a use-after-free in Adobe Reader's multimedia plugin triggered by media.newPlayer(). Actively exploited as a zero-day in December 2009. (identified after JavaScript deobfuscation)
  • 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. (identified after JavaScript deobfuscation)
  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • 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.pdf-repair.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • 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/
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0040_000.js
479709d781d3e822daffb67b734746d6560150ce79b6e5e1c0a6bc6750c65f27		 pdf-javascript-stream PDF /JS object 40 at offset 0x55A9C 24715 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).
numeric_charcode_stage_000.js
ac1193fbfef7e653f2145890a293c08f22dc2e7a1179bb2a8723ff2ecf90307e		 deobfuscated-js numeric char-code fromCharCode decoded JavaScript at offset 0x55ABE 7513 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 25 eval/decoder/string-building token(s).

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