Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b8f7775f5ad01b…

MALICIOUS

PDF

28.2 KB Created: 2010-04-02 14:20:49 +08:00 Authoring application: Acrobat Web Capture 7.0
MD5: d9b09a2a7524b8a63d3aedf64fb57150 SHA-1: 0265f7e0be44ee959153b15f067af058c78e27d5 SHA-256: 20b8f7775f5ad01bd7d0d9c0804ab8c2f039f49faa136b7c521019f9f9ba2766
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, flagged by heuristics for eval() calls and general maliciousness. The ML classifier assigned a high probability of maliciousness. The JavaScript stream, identified as 'stream_003_off0000568b.js', is heavily obfuscated, suggesting an attempt to hide its true functionality. The primary intent appears to be the execution of this script, which likely downloads and executes a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • 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.
  • 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
stream_003_off0000568b.js
49c544afecc35ab5484666827f9498ddac7995796633ebfc3894ec1fdb2dd5de		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x568B 25322 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.