Malicious PDF — malware analysis report

Static analysis result for SHA-256 547a499929c62dfa…

MALICIOUS

PDF

23.6 KB
MD5: 25f2db6209a61ef89f3ebdb84288650e SHA-1: 6b55733e8b25c0bca5fb2114f45c4bf6301a02fe SHA-256: 547a499929c62dfae49a61894aaa674cd58d4649a2dc9e81bb4cfc51f4b19354
60 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. Heuristics indicate the presence of JavaScript actions and streams, including the use of String.fromCharCode, suggesting obfuscation. The embedded JavaScript files, 'javascript_obj0099_000.js' and 'deobfuscated.js', are the primary indicators of malicious activity. The likely intent of the script is to download and execute a second-stage payload, although the exact mechanism is obscured.

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
b6096dc0349ca0fd249d5098e4e96a4bac2e35ff75634eca28c187817dba73e2		 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
2ec2ba906055a5fa563e06e0b0d0862ae30da18e72ae5a73fbc1591557e70cd0		 deobfuscated-js PDF JavaScript deobfuscation pass 41588 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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