Malicious PDF — malware analysis report

Static analysis result for SHA-256 9168e308af088640…

MALICIOUS

PDF

32.0 KB Authoring application: G198G147G198G147G198G162G165G150G153G207G144G204G159G150G204G162G204G144G147G198G147G198G159G198G159G168G207G201G201G198G159G147G198G198G153G147G156G195G147G207G198G159G195G198G147G207G156G204G201G147 (via 204G159G162G204G195G168G207G153G207G144G198G159G198G159G198G159G198G153G198G159G147G198G198G153G147G201G204G159G150G204G198G159G147G198G198G153G153G156G144G201G165G207G147G195G147G198G147G198G150G159G)
MD5: bb36fe8f7c9df5c8b19db898c8171a60 SHA-1: c34f8707c28f35f557a1c0d6339e806e42c6baf0 SHA-256: 9168e308af088640bd0cf308b57356f08b8c8231df854ca04ea140da4e2b6c25
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file flagged by ClamAV as 'Pdf.Dropper.Agent-7282971-0' and a machine learning classifier. Heuristics indicate the presence of embedded JavaScript, specifically a stream that uses String.fromCharCode, suggesting obfuscation. This JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for dropper malware. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Dropper.Agent-7282971-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7282971-0
  • 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
2fcc44625b9647c86a294ad904f35014a021103976e42d09209624c0dab33176		 pdf-javascript-stream PDF /JS object 99 at offset 0x7C8C 1488 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

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