Malicious PDF — malware analysis report

Static analysis result for SHA-256 41d113bc66ffabc2…

MALICIOUS

PDF

12.8 KB
MD5: c28a2965fd5acc4dee8a2b4979a633db SHA-1: b4356c57849567dd587fe441eb5fff2bb55abca1 SHA-256: 41d113bc66ffabc2dc890122d72e8680a4dfd51132b46718fe0caeea07db8e03
226 Risk Score

Malware Insights

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

The PDF file contains XFA form elements which are known to be vulnerable to heap spray attacks. Heuristic firings indicate the presence of exploit code and embedded script payloads designed to execute malicious content. ClamAV detection further confirms the malicious nature of the file, identifying it as Pdf.Exploit.Agent-6136306-0. The primary attack vector appears to be leveraging XFA scripting to achieve arbitrary code execution.

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
38c25abeea89a04dcdbe900d9c93b63c3dee0c3a602ee21be2e8e59660d07fa5		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12319 bytes

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