Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b2d50e4a33445f…

MALICIOUS

PDF

11.9 KB
MD5: bd9c96de0e953f90b683c6089cb2ab90 SHA-1: 4aaf75cd163f4c7ccdd151fd2d9f4580d882c3c3 SHA-256: 08b2d50e4a33445f99cd1ec696c142b70baaec41a16fe8f6f55874c8db555025
148 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The embedded JavaScript is designed to exploit this vulnerability, likely to download and execute a second-stage payload. The ML classifier strongly indicates maliciousness, and the presence of XFA heap spray heuristics confirms the exploitation vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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.
  • 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.
  • 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_00002310.bin
985d821e68aa4849f4519da48ef61d0f71a2c198ae33eb2af37ec5c16b12665a		 pdf-embedded-script PDF raw stream script payload at offset 0x2310 3545 bytes

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