Malicious PDF — malware analysis report

Static analysis result for SHA-256 e66834abb9a42dd7…

MALICIOUS

PDF

142.6 KB Created: 2008-11-21 14:58:09 UTC Authoring application: Acrobat Web Capture 6.0 版
MD5: 65b217bf805321263c0a4e8e3c323c5c SHA-1: cbf9c6bd9df2ed91b0c1200a446c3d88d692a584 SHA-256: e66834abb9a42dd7a574988d48e6938b48678734a1b916d0d21c9cf8c3fcbef1
136 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV with the signature Html.Trojan.Agent-35518. Further analysis revealed embedded JavaScript, identified as Js.Exploit.Shellcode-18, which is a strong indicator of a malicious payload delivery mechanism. The JavaScript is likely responsible for downloading and executing a second-stage payload from a remote source, although the specific URL or execution method could not be fully determined from the available data.

Heuristics 5

  • ClamAV: Html.Trojan.Agent-35518 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Html.Trojan.Agent-35518
  • 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
73603d35ca9f2244fac73505ab133d3d1d2afee6faebe821bb9424f6bf2e4b23		 pdf-javascript-stream PDF /JS object 33 at offset 0xA4D 16192 bytes
Detection
ClamAV: Js.Exploit.Shellcode-18
Obfuscation or payload: unlikely

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