Malicious PDF — malware analysis report

Static analysis result for SHA-256 2330dc1a6554db77…

MALICIOUS

PDF

54.2 KB Created: 2008-05-26 10:24:36 UTC Authoring application: Acrobat Web Capture 6.0 版
MD5: c19e804fd85a014c0b0497b0c5af4c81 SHA-1: 26acdc9696960e857b2503d852ca726f1d1fa3b3 SHA-256: 2330dc1a6554db772d671beceeb1dcb0f84aca9247a43386b99354fd6cff1890
166 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by multiple heuristics, including ML classification and ClamAV detection, specifically identifying it as 'Js.Exploit.Shellcode-18'. The presence of embedded JavaScript, indicated by the 'PDF_JAVASCRIPT' and 'PDF_JS' heuristics, strongly suggests that the script is responsible for the malicious behavior. This script likely downloads and executes a second-stage payload, a common technique for malware delivery. The specific nature of the payload could not be determined due to the obfuscation or truncation of the script.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
968f8b46e48ade20110f8248117012beb71d5f091fc1376f8a79072951bedbdb		 pdf-javascript-stream PDF /JS object 33 at offset 0xA74 12644 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely

Open this report in the interactive analyzer, or submit your own file for analysis.