Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e3124c752ac32a…

MALICIOUS

PDF

45.9 KB Created: 2008-05-09 11:45:15 UTC Authoring application: Acrobat Web Capture 6.0 版
MD5: 7748013bd0a987fc7f5c805692063fed SHA-1: 3cc2b3e80f45f6108e224ca3dcfdc0a6b259205d SHA-256: 55e3124c752ac32a4ba43aea2c8a55be42af830d04f3b58895cda9161213a290
136 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

The file is a PDF containing embedded JavaScript, as indicated by multiple heuristic firings and the presence of an embedded JavaScript object. ClamAV detections (Js.Exploit.Shellcode-18) confirm the malicious nature of the embedded script. The script is likely designed to download and execute a second-stage payload, a common technique for initial access and further system compromise. The benign URLs extracted do not detract from the malicious indicators.

Heuristics 5

  • ClamAV: Js.Exploit.Shellcode-18 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Js.Exploit.Shellcode-18
  • 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.
  • 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 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/1999/02/22-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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0033_000.js
053375dcf5b6f59e220547d44923075652a4290b1012dab8141be429fa156896		 pdf-javascript-stream PDF /JS object 33 at offset 0xA72 9716 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely

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