Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4a9af2c613eec65…

MALICIOUS

PDF

12.8 KB
MD5: e6b2b34e0f31d9ba17e8f6d248a5aa08 SHA-1: f5b1039c88af6cb73288c667c8f27e337ed41688 SHA-256: f4a9af2c613eec658faae7441a193469d99a673c1d151ccba36003c85f13f8f9
228 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1059.007 JavaScript/VBScript

This PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Critical heuristics indicate a heap spray exploit code within an XFA form, triggered by executable script. This suggests the file is designed to download and execute a second-stage payload, as indicated by the ClamAV detection name 'Pdf.Exploit.Dropped-78'. The ML classifier also strongly flagged this as malicious.

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.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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
161b5e4d881c0760234f22da535309e0e46dedee35a2dedf322a298d43612004		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12312 bytes

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