Malicious PDF — malware analysis report

Static analysis result for SHA-256 72b44f8d5b98d279…

MALICIOUS

PDF

297.3 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: 5842e527ee70ffd5b92721094c64a693 SHA-1: d01fb12bb974603ef27a1c8d6e90a779591ed180 SHA-256: 72b44f8d5b98d279e5102ef0d9755e7b1aa0df2201fe77ca414b5b8a784c42b5
346 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF file that contains embedded JavaScript, which is used to exploit CVE-2007-5659 (Collab.collectEmailInfo). This exploit cluster, combined with ML classification and ClamAV detection (Win.Trojan.Dropper-82), indicates a malicious dropper. The embedded JavaScript likely downloads and executes a second-stage payload, as suggested by the 'PDF JavaScript exploit cluster' and 'extracted artifact' heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9403

Heuristics 11

  • 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)
  • 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.
  • 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)
  • 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
  • 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://tpprc.org/publications/pubs/autonomy_and_tibetan_perspective-2005.pdf
    • http://www.cclaw.net/library/legislationlaw.php
    • http://eastwestcenter.org/fileadmin/stored/
    • http://www.savetibet.org/news/newsitem
    • http://hrichina.org/public/PDFs/MRG-HRIC.China.Report.pdf
    • http://www.tibet.com/future.html
    • http://ch.China-embassy
    • http://www.article
    • http://en.tibet.cn/news/tin/t20060718_134212.htm
    • http://www.w3.org/1999/xhtml
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://www.rsf.org/article.php3?id_article=22307
    • http://unhcr.org/cgi-bin/texis/vtx/refworld/rwmain?docid=423ea9094
    • http://belfercenter.ksg.harvard.edu/files/
    • http://hrw.org/english/docs/2006/10/09/china14364.htm
    • http://hrw.org/reports/2007/tibet0607
    • http://www.iht.com/articles/ap/2007/09/13/news/UN-GEN-UN-Indigenous-Peoples
    • http://timesonline.co.uk/
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0017_000.js
a855e1484b6aa802ce0f6f936ba6d5b5bb5556ec34d1f510cb7f17c768fa4311		 pdf-javascript-stream PDF /JS object 17 at offset 0x764 4622 bytes
Detection
ClamAV: Win.Trojan.Dropper-82
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).
font_00_cff_off000111bd.bin
b59c8b56bbd05b39731d026bb1e9a68d718236fcba29d458ced3ef1809ab6dc9		 pdf-font-stream PDF embedded font (cff) at offset 0x111BD 6001 bytes
font_01_cff_off00012aad.bin
5d7296b100fea97c4ff10a4765b0e263b1a96621ff7aec254a4bce68ab323933		 pdf-font-stream PDF embedded font (cff) at offset 0x12AAD 10198 bytes
font_02_cff_off00015139.bin
123145918844774e735074b07137e840110a5748007f3db4811abf6d03cc89be		 pdf-font-stream PDF embedded font (cff) at offset 0x15139 7429 bytes
font_03_cff_off00016d59.bin
f1644939785a2ce809d70b82add71e80b9619bbe1f13756f0d67e5d9815bf82b		 pdf-font-stream PDF embedded font (cff) at offset 0x16D59 5031 bytes

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