Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c40aa9bfcc2374…

MALICIOUS

PDF

114.8 KB
MD5: bc2d5dfb9bab109b6222664272f830e6 SHA-1: 8add8e88b82ffd89b4e704fe37baa0ad54443f6d SHA-256: d2c40aa9bfcc2374466b82602e9400838f5169b4572ac076361268c8514041c9
218 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link T1566.001 Spearphishing Attachment T1190 Exploit Public-Facing Application

The PDF file contains XFA form elements which are known to be vulnerable to heap spray attacks. The embedded JavaScript is designed to exploit this vulnerability, likely leading to the download and execution of a second-stage payload. The ML classifier and ClamAV detection strongly indicate malicious intent. While specific family attribution is not possible, the exploit pattern is clear.

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
  • 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.
  • 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_pdf_script_0000023c.bin
1250a60cb045624c659472cc861ee46d75d9bf6db4dc1e1348c0ed5f2991dca7		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 116826 bytes

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