Malicious PDF — malware analysis report

Static analysis result for SHA-256 6653a06c57beaa11…

MALICIOUS

PDF

4.1 KB
MD5: 3260f4fab1af7aede0f3b1d6d9fc340a SHA-1: 8f4e6be8ce5349fffcd5e3df61d8681eb879c53a SHA-256: 6653a06c57beaa11a8b10dab1c62aa547de1180d2e445d7425e7dc83bd71303f
130 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample utilizes XFA forms and embedded JavaScript, indicated by PDF_XFA and PDF_XFA_SCRIPT heuristics. The embedded JavaScript, identified as stream_000_off00000289.js, is likely responsible for downloading and executing a secondary payload, as suggested by the PDF_EMBEDDED_SCRIPT_PAYLOAD firing and the ML_NYX_PDF_MALICIOUS score. The presence of eval() calls further supports the dynamic execution of malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT
    PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low PDF_EMBEDDED_SCRIPT_PAYLOAD
    PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
  • 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/1.0/
    • http://www.xfa.org/schema/xfa-template/2.5/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xfdf/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off00000289.js
ba911a47463ed096318fa8ed50f1aad6a7dc1b7fb5e62bcb045693f58db293a2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x289 10365 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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