Malicious PDF — malware analysis report

Static analysis result for SHA-256 49a6635e883941de…

MALICIOUS

PDF

104.6 KB
MD5: 60fb6997045a1c5c62aac0eb8e4a5a14 SHA-1: b842a35a411040eef9808daad3cf6f5b9486ab0b SHA-256: 49a6635e883941de2080ec5bc36f615ed6fcac72de739ec2006c0ac9a4403510
248 Risk Score

Malware Insights

The file is a PDF document that leverages XFA (XML Forms Architecture) to deliver a malicious payload. Heuristics indicate the presence of XFA heap spray exploit code and risky executable script within the document. This suggests the document is designed to exploit vulnerabilities in PDF readers that support XFA forms, likely leading to the execution of a second-stage payload. The ClamAV detection further confirms its malicious nature.

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.
  • 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
  • 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
b8daef73e886b3cffd839699e5f5d2faf6d045e8759ed352444601ae850cabb5		 pdf-embedded-script PDF raw stream script payload at offset 0x23D 106353 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36370
Obfuscation or payload: unlikely

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