Malicious PDF — malware analysis report

Static analysis result for SHA-256 9644532fd5c43766…

MALICIOUS

PDF

35.6 KB Authoring application: 204G159G162G204G195G168G207G153G207G144G198G159G198G159G198G159G198G153G198G159G147G198G198G153G147G201G204G159G150G204G198G159G147G198G198G153G153G156G144G201G165G207G147G195G147G198G147G198G150G159G
MD5: e457c8c886793ecc882ed32cfd180d2b SHA-1: 8b68c937bd704d46f53bed03c286c7c53e1e89ef SHA-256: 9644532fd5c437660661246d39bbe8961af8a78c6e305876a0e8debfe5222b54
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier also flagged this PDF as malicious with high confidence. While the document body is unreadable, the presence of JavaScript suggests an attempt to execute malicious code. The embedded artifact 'javascript_obj0099_000.js' is a key indicator of this malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • String.fromCharCode low PDF_FROMCHARCODE
    String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
  • PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE
    PDF has 1 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0099_000.js
575d0bdd008d8572f586a62acebd6d1e2a336885188cd717a7b33f5bd1ab0215		 pdf-javascript-stream PDF /JS object 99 at offset 0x7FB3 11272 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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