Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43ee2d9c1a787ad…

MALICIOUS

PDF

23.6 KB
MD5: dfd161ac88f904c3e6308f9f8e2757cf SHA-1: 57b1fc22d5cdba9bcd711c7eb63192637808baa3 SHA-256: d43ee2d9c1a787ad5c6b1b7833b74ddab270c63de52f75999e7ac7d7545540ec
60 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 strongly flagged this PDF as malicious. The presence of extracted JavaScript files, 'javascript_obj0099_000.js' and 'deobfuscated.js', suggests the script is designed to download and execute a second-stage payload. The document body was unreadable, but the heuristics and extracted artifacts point to a malicious script execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0099_000.js
df6fff9d0f544638c4cb74f201ad16c2276093370e4245e4a276a10584f534c3		 pdf-javascript-stream PDF /JS object 99 at offset 0x548D 8561 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 9 long base64-like blob(s).
deobfuscated.js
1911bce59a7e68f2f461802a44203312edab91f546615c27afa444f6898ba763		 deobfuscated-js PDF JavaScript deobfuscation pass 40530 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 18 long base64-like blob(s).

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