Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9759482a1788383…

MALICIOUS

PDF

11.7 KB
MD5: 98643a170adf1c3a16a63e410e406267 SHA-1: 70d66903f7dcfda04dc92b969112fb1f28a75295 SHA-256: d9759482a17883839ce364769719732c326345d99a665583f1773caff3a1aa8f
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF file contains XFA forms with JavaScript that triggers a heap spray exploit. This is designed to download and execute a secondary payload, as indicated by the 'Pdf.Exploit.Dropped-78' ClamAV detection and the ML classifier's high confidence. The embedded file and XFA script are critical indicators of this malicious behavior.

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
b318ff3b66ae9a30b100ec8f99f4f73a5716afef87e30fde5a4cfb82370a5258		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11211 bytes

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