Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec678ed07cbcf7cd…

MALICIOUS

PDF

35.5 KB Authoring application: 204G159G162G204G195G168G207G153G207G144G198G159G198G159G198G159G198G153G198G159G147G198G198G153G147G201G204G159G150G204G198G159G147G198G198G153G153G156G144G201G165G207G147G195G147G198G147G198G150G159G
MD5: 25552f66f778f033176b7fcc1d1f132c SHA-1: 55dcdcc94d28aa8358f2166ab5e239e749d1a8d8 SHA-256: ec678ed07cbcf7cd2d5d85ca82ecd05f7afd793992d728ad774138131889c8aa
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript

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. The embedded JavaScript file 'javascript_obj0099_000.js' is the primary indicator of malicious activity, suggesting it's used to download and execute a second-stage payload.

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
e93b9341dfb5240c48a9ec4b584493707a7aad4e6c0c024a2d6825c29e7f5f4f		 pdf-javascript-stream PDF /JS object 99 at offset 0x7F91 11109 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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