Malicious PDF — malware analysis report

Static analysis result for SHA-256 baa4d7617ac3b14b…

MALICIOUS

PDF

12.7 KB
MD5: 31489a8f7d9054c903fb15790d5043e7 SHA-1: b0ddd5d7297de67b2e1c1a172e4a70630854bf0c SHA-256: baa4d7617ac3b14b363697a0f697e2511ff9d89294a4be5f1fec58d135bd954c
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious PDF

The PDF document contains XFA forms with heap spray exploit code, as indicated by critical heuristic firings. This suggests the document is designed to trigger a vulnerability in PDF viewers that support XFA forms. The embedded script payload and ML classifier further confirm its malicious nature. The ClamAV detection ID 'Pdf.Exploit.Agent-6136306-0' is the primary IOC.

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
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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_file_obj0008.bin
dcee61aede82e23e43fbb748fa92345e563abe340c784ffe197cde7b3d1657ad		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12259 bytes

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