Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d9e726a0b53c9b…

MALICIOUS

PDF

46.5 KB
MD5: 69686611c579ddded91ffc0f5be3b330 SHA-1: 5c58548bcae99605379d68ac5bc8b07ef28dad45 SHA-256: 11d9e726a0b53c9b2a891437c221156ce8353a897e2f3851d62b0547504dd226
178 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

This PDF file contains obfuscated JavaScript, identified as a PDF JavaScript exploit cluster. The script is designed to download and execute a second-stage payload, as indicated by the heuristic firings and the nature of the embedded JavaScript. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER
    PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
  • 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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
20f3bdc610f7da724772f00e1ce02e66231c55a343d81ad70536fc74b06552cc		 pdf-javascript-stream PDF /JS object 12 at offset 0xA1FD 4738 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 long base64-like blob(s).

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