Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a838d3f55fdd3c2…

MALICIOUS

PDF

45.4 KB
MD5: 1d9d4f5fa9dfe79f30f587eed6404bc0 SHA-1: 1ce26998d082473c232aacc9f784aa9f13078d04 SHA-256: 1a838d3f55fdd3c2731601430fc69739b1207f32c0c34e49b14d367cdbd91d3d
114 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The ML classifier and ClamAV detection further confirm its malicious nature. The embedded JavaScript is likely responsible for executing malicious code, potentially downloading further payloads or exploiting vulnerabilities. The specific intent of the script could not be fully determined due to obfuscation, but its presence is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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
f51561a0595b25e8fe90a421a238a6a47aa91cf9f8d2e681e3ee9d8d122a1c48
pdf-javascript-stream PDF /JS object 12 at offset 0xA1E2 4013 bytes