Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a4134f37bae89c…

MALICIOUS

PDF

61.8 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: 0ecd3ce53eef559bbf1aa4f81ae56060 SHA-1: fae37597ea96a381ed84ef35a26458d7f33002f4 SHA-256: 35a4134f37bae89cab9c2ea977de2c9be7a2922c4df706225afe622deac80a11
254 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.001 PowerShell T1059.003 Windows Command Shell T1059.007 JavaScript

The PDF file contains embedded JavaScript and triggers a critical CVE-2007-5659 vulnerability related to Collab.collectEmailInfo. This indicates the document is designed to exploit a known flaw in PDF readers to execute arbitrary code. The embedded JavaScript, named 'javascript_obj0032_000.js', is likely responsible for downloading and executing a secondary payload, as suggested by the ClamAV detection of a 'Win.Trojan.Dropper-82' on both the initial PDF and the extracted artifact. The document body itself contains minimal exploitable content, suggesting the primary attack vector is the embedded script and 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)
  • 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://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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0032_000.js
ca888cb53dc32e04a689c15bce516928db86c1509f50cf6f27a3a0c38dd5fa4a		 pdf-javascript-stream PDF /JS object 32 at offset 0x156A 4622 bytes
Detection
ClamAV: Win.Trojan.Dropper-82
Obfuscation or payload: likely
Carved artifact contains 16 eval/decoder/string-building token(s).

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