Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b88c761544a1c4…

MALICIOUS

PDF

175.1 KB
MD5: 7b4d895296e92fc18468c1b86b42ef5c SHA-1: 03de66bb6d47fb56d16a5522914ab66953f0482c SHA-256: 99b88c761544a1c4105c297e9e57268bcad9ad07f06b75895465bd2d9fe1ca56
84 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The ClamAV detection 'Heuristics.PDF.ObfuscatedNameObject' further suggests malicious intent. While the document body is heavily obfuscated and unreadable, the presence of JavaScript points to an attack pattern involving code execution. The embedded URLs are benign or unknown, but the JavaScript itself is the primary indicator of malicious activity. The exact function of the JavaScript could not be determined due to obfuscation, leading to a moderate confidence score.

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0012_000.js
c4ba3591c3074e8fbc2f51681f2267ae4d6650196a96437268cf3aa864f515e3
pdf-javascript-stream PDF /JS object 12 at offset 0x2B086 5835 bytes