Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c1a0968bd1e405…

MALICIOUS

PDF

12.8 KB
MD5: adb23f1965fb5b8a904b4cb5d2b1a5af SHA-1: c45771af08b87e63be415e13cecd668b276ae75c SHA-256: 09c1a0968bd1e40515359d5841db81e488beb53bac76d03fe3d5fd77749fe6a1
216 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF sample contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. Heuristics indicate the presence of XFA JavaScript heap-spray exploit code and a risky executable script. This suggests the file is designed to exploit a client-side vulnerability, likely to download and execute a secondary payload, as indicated by the ClamAV detection name 'Pdf.Exploit.Dropped-78'. No document body text was available for further analysis.

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 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 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_file_obj0008.bin
c7643b9f0ee8d8b98ff351785ff31455a41e5084899c796537e8ddb6c32c1665		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12336 bytes

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