Malicious PDF — malware analysis report

Static analysis result for SHA-256 320db6bcd78f3325…

MALICIOUS

PDF

12.7 KB
MD5: 133ce1986b99542b5c8312fb07e98ae4 SHA-1: ecdf8721e773db9f8472892a8d03a246690ec9db SHA-256: 320db6bcd78f33259ea9230f13c5abec064c1796736f4baefb2645645ade5006
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter

This PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. Critical heuristics indicate a PDF XFA heap spray exploit, suggesting the file attempts to spray the heap with exploit code. It also contains embedded script payloads and is flagged by ML classifiers and ClamAV as malicious. The primary attack vector appears to be leveraging a vulnerability within the XFA form processing to execute arbitrary code, likely leading to the download and execution of a secondary payload, as indicated by the ClamAV detection name 'Pdf.Exploit.Dropped-78'.

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
e8869661a1d86deed19a22143183084f18404429c4acd2fb7855bbe5ed337242		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12288 bytes

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