Malicious PDF — malware analysis report

Static analysis result for SHA-256 00156a9a528a9435…

MALICIOUS

PDF

9.6 KB Created: 2008-02-14 17:33:19 -03:00 Authoring application: Acrobat Editor 8.0 (via Adobe Acrobat 8.1.0)
MD5: 8e85b2691dec0b2e5ee9f9767e7bd102 SHA-1: b176344777606fa4bfe04ce2608731bfa4f55dbf SHA-256: 00156a9a528a9435a4b49eb74ac7b8c410943e3e7aa96cea86b8481523c58030
218 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.001 Command and Scripting Interpreter: JavaScript T1071.001 Application Layer Protocol: Web Protocols

The PDF file contains embedded JavaScript that exploits CVE-2007-5659, a vulnerability in Adobe Reader's Collab.collectEmailInfo function. The script is designed to download a second-stage payload from the URL http://digitaltreath.info/cgi-bin/index.cgi?9df29d6200004e5c0281594752020000000002d5e3891a000000000000000017000. This indicates a typical downloader or dropper attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 8

  • 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)
  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL
    Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
  • 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.
  • 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://digitaltreath.info/cgi-bin/index.cgi?9df29d6200004e5c0281594752020000000002d5e3891a000000000000000017000
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0028_000.js
ab3624641d51d0dc12a9a192ed6b10eb6e1605478304174dc3a0bbd8241625d6		 pdf-javascript-stream PDF /JS object 28 at offset 0x778 6148 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
legacy_pdfkit_stage_000.js
6c0a1c785133b4284bb1ace4da629395361c53386c80d751d79b2c2d612b1775		 deobfuscated-js CRC32 callee-key hex decoded JavaScript at offset 0x778 2148 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 3 eval/decoder/string-building token(s).

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