Malicious PDF — malware analysis report

Static analysis result for SHA-256 01c205a04bf24427…

MALICIOUS

PDF

93.9 KB Created: 2008-03-03 17:06:20 +08:00 Authoring application: PScript5.dll Version 5.2 (via Acrobat Distiller 6.0.1 (Windows))
MD5: b2256c1736389953b7fc1485297999ca SHA-1: b888f18107316e39be71f32e02274d394ffaab08 SHA-256: 01c205a04bf2442737f22fa5d1b01dd0c4f8c995a3b557568a8acf76fa33f6db
348 Risk Score

Malware Insights

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

This PDF file is identified as malicious due to critical heuristic firings indicating a JavaScript exploit cluster and a specific vulnerability (CVE-2007-5659) related to the Collab.collectEmailInfo method. The embedded JavaScript streams, particularly 'combined_document_js_000.js', contain obfuscated code that, when deobfuscated, likely attempts to exploit this vulnerability to download and execute a secondary payload. The ClamAV detection of 'Win.Trojan.Dropper-82' on both the main file and extracted artifacts further supports its role as a dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 12

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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.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/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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0033_000.js
dab4f244b008bff3543c591947e8282109fd71093d31924f04e2ce1f70320419		 pdf-javascript-stream PDF /JS object 33 at offset 0x151A 5283 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).
javascript_obj0041_001.js
03574e1d20835705dbdbe0505985a8472366bec2262ccb79f03184e327e7082a		 pdf-javascript-stream PDF /JS object 41 at offset 0x132A5 5283 bytes
Detection
ClamAV: Win.Trojan.Dropper-82
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).
javascript_obj0043_002.js
2c1ce5cbb5db7586402afa5caaf9bc4858f97e1cd58bc88fe7eb9a74a0caeb1d		 pdf-javascript-stream PDF /JS object 43 at offset 0x14A3E 5283 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).
combined_document_js_000.js
1c10db57b8e35bea14976962e52d6f3c6c4b9b9f1185cad651656ba1bf02d405		 deobfuscated-js combined document JavaScript streams at offset 0x151A 21135 bytes
Detection
ClamAV: Win.Trojan.Dropper-82
Obfuscation or payload: likely
Carved artifact contains 64 eval/decoder/string-building token(s).

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