Malicious PDF — malware analysis report

Static analysis result for SHA-256 9237cb5da83be8ee…

MALICIOUS

PDF

84.3 KB
MD5: a9557b02e3db2a9d548d8087897eb399 SHA-1: 66d37c0b02f8d338682d9af523f4ec492fb59e90 SHA-256: 9237cb5da83be8eec85f0394a0390c335e96a53b4c23786e09a59d8ca55ed6fe
162 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 JavaScript/JScript T1204.002 Malicious JavaScript T1566.001 Spearphishing Attachment

This PDF file utilizes XFA (XML Forms Architecture) with embedded JavaScript, triggering a heap spray exploit. The embedded script is designed to download and execute a secondary payload. The ML classifier strongly indicates malicious intent, and the presence of an embedded script payload further supports this. The specific JavaScript code is heavily obfuscated, but the overall pattern suggests a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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.
  • XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY
    PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
  • Embedded script payload in PDF stream medium 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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://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
embedded_pdf_script_00000aa0.bin
c7d84c7e2c8e585f1b82832ad6731ad671705f3be24311fa2b779d8b2fc0def8		 pdf-embedded-script PDF raw stream script payload at offset 0xAA0 83619 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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