Malicious PDF — malware analysis report

Static analysis result for SHA-256 e02418d1582742aa…

MALICIOUS

PDF

19.0 KB Created: 2008-04-28 09:01:36 +08:00 Authoring application: Acrobat Web Capture 7.0
MD5: 5b62d479106e8ba11ae65753c4e9d987 SHA-1: 7efa2114ca8b13e9780fa12c0169ccdbd982fa5a SHA-256: e02418d1582742aa717573ed528a4b327f3cd9ef67624a7caf3f803b734a8e5c
136 Risk Score

Malware Insights

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

The PDF file contains embedded JavaScript, as indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. ClamAV detections 'Js.Exploit.Shellcode-18' on both the main file and an extracted artifact strongly suggest this JavaScript is malicious. The primary function of the embedded script is likely to download and execute a second-stage payload, a common technique for initial access.

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/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0037_000.js
28c679c017fc3ac9fe014758666d880b130caf0ae4c52a62dcc4709678e77d97		 pdf-javascript-stream PDF /JS object 37 at offset 0xA37 9600 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely

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