Malicious PDF — malware analysis report

Static analysis result for SHA-256 9440874d81d0c9f7…

MALICIOUS

PDF

711.7 KB Created: 2008-02-27 16:58:09 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))
MD5: 3ffeba759d09fe7e662ad74bc9432451 SHA-1: c2b08f5a898c6efc9ed86d887361b6c0f1ba473c SHA-256: 9440874d81d0c9f70724f58617774622587c343e0bbd568f11a501e2296bf24e
292 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript T1204.001 Malicious Link T1071.001 Web Protocols

The PDF file contains embedded JavaScript that utilizes the 'unescape()' function and exploits the CVE-2007-5659 vulnerability (Collab.collectEmailInfo). This JavaScript is designed to download and execute a secondary payload, as indicated by the 'Win.Trojan.Dropper-82' ClamAV detection on the main file and an extracted artifact named 'javascript_obj0017_000.js'. The primary attack vector is likely a user interaction with the malicious PDF, triggering the exploit.

Heuristics 10

  • 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)
  • ClamAV: Win.Trojan.Dropper-82 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Win.Trojan.Dropper-82
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/iX/1.0/
    • 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/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
a855e1484b6aa802ce0f6f936ba6d5b5bb5556ec34d1f510cb7f17c768fa4311		 pdf-javascript-stream PDF /JS object 17 at offset 0x136D 4622 bytes
Detection
ClamAV: Win.Trojan.Dropper-82
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).
font_00_sfnt_off000103b8.bin
f2d3ddaf37a72cba3c7ace9593fe1293e6cb16a85914141aeacfa807d3d3ee1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103B8 114364 bytes
font_01_sfnt_off0001d8e1.bin
fb3cdeed6fea510c177789248ed88b9edee517f142466d9b19b685c7990d47a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D8E1 103760 bytes
font_02_sfnt_off00096f5d.bin
c56e7a4f72e44bec08ff46f254a4c9d1a90f0b6985c0f977b36d0abfc1c3888b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x96F5D 20658 bytes
font_03_sfnt_off0009a3da.bin
b5cab00070440ead553afb5e84a4b01b453dd5f667abf18613aa90065df5e587		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A3DA 104452 bytes
font_04_sfnt_off000a5da5.bin
98c6e1ecb2950e83fa7f16546976c381d8ab112f8ea665934299528e0fbc4031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA5DA5 105079 bytes

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