Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5b05471e146165…

MALICIOUS

PDF

114.8 KB
MD5: 63f7af3bd5ae3d89022db8865d93979f SHA-1: 651b666eb6d0dc657a3c4fc45f8acd3d741daf95 SHA-256: 5a5b05471e146165c3e66c9d1daa7ea7bc853d8a569d27884ec3cae25c8417a9
208 Risk Score

Malware Insights

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

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to exploits. Heuristics indicate a heap spray exploit using JavaScript within the XFA form, designed to execute arbitrary code. The embedded script, though obfuscated, appears to be constructing a string for execution, likely to download and run a secondary payload. This is further supported by ClamAV detection of 'Pdf.Exploit.Agent-6136306-0'.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • 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_pdf_script_0000023c.bin
4744fbc1a54f9c764985bcd1b24abef3c4e773538c9524133e576c85bef6ea5f		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 116826 bytes

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