Malicious PDF — malware analysis report

Static analysis result for SHA-256 676b120ecaf66736…

MALICIOUS

PDF

114.8 KB
MD5: 6e068b732ce6d7c2587b4d3308b401b0 SHA-1: 22c24a6daa339dbdb3f111565aea57bfb9d0792d SHA-256: 676b120ecaf667364c7ac76fde29e54c24569d5898d22e10f9b266d3e0271f26
208 Risk Score

Malware Insights

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

The PDF sample contains XFA (XML Forms Architecture) which is known to be vulnerable to exploits. Heuristics indicate the presence of XFA JavaScript heap-spray exploit code and risky executable script. The embedded JavaScript is heavily obfuscated but appears to be designed to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-6136306-0' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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.
  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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/xfa-template/2.5/
    • http://www.xfa.org/schema/xfa-data/1.0/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_pdf_script_0000023c.bin
4743e23bd92112c4e0f2475475483544cc7e5db9c7e1ad5d12709e0fc5a92a08		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 116824 bytes

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