Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa2fdfa081d83b85…

MALICIOUS

PDF

87.0 KB
MD5: 202249e97054351ae9ffe580b7671057 SHA-1: c5a540eb0424c94156e5c2a9243e2dee8a04637f SHA-256: aa2fdfa081d83b8552e3364e73335cedfa3bc298c432ae1b839950dd831659d0
118 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was flagged as malicious by ML classifiers and ClamAV due to obfuscated JavaScript content. The embedded JavaScript stream, named 'javascript_obj0003_000.js', is highly likely to be responsible for downloading and executing a secondary payload, which is a common technique for initial access and further infection. The presence of XFA forms and JavaScript actions further supports this attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9672

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • 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://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0003_000.js
7142802fa3f1175fb56ea67461141d5a162d8a253223f8bacbb1da0f2bee8073		 pdf-javascript-stream PDF /JS object 3 at offset 0xCD 34157 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 13 long base64-like blob(s).

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