Malicious PDF — malware analysis report

Static analysis result for SHA-256 0604734e4e769e43…

MALICIOUS

PDF

104.0 KB
MD5: da64f08145bc4c2dbb061fada1df7354 SHA-1: a462cb50414b8eae1a49c74027df2fae3c2bb3ac SHA-256: 0604734e4e769e433a495808ab7bce0b4a3876f1b7128fd474e79e10979afa48
268 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, obfuscated within the script block, is designed to execute and likely download a secondary payload. Heuristic firings and ClamAV detections confirm the malicious nature of the exploit. The specific exploit code and obfuscation suggest a downloader or dropper functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • ClamAV: Pdf.Exploit.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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_0000023d.bin
4e89f60d0b5b8e63012c306d28b8d000d21c8c7ccb2b93145c4cc572cbd781dc		 pdf-embedded-script PDF raw stream script payload at offset 0x23D 105775 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36370
Obfuscation or payload: unlikely

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