Malicious PDF — malware analysis report

Static analysis result for SHA-256 39850d0bbe367569…

MALICIOUS

PDF

12.1 KB
MD5: 32ae9f39ba2de10505b10f46d54ddb5a SHA-1: 052d9868796077dbed4ed6a0078f8250066d68ab SHA-256: 39850d0bbe367569b83ffdf1fd15cad6faab3426377806ff72e246f73981d2a2
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 critical XFA heap spray exploit code and risky executable script, as indicated by multiple high and critical heuristic firings. The ML classifier also flagged it with high confidence. ClamAV identified it as Pdf.Exploit.Dropped-78, suggesting it's a known dropper. The embedded file and XFA script are likely responsible for executing the malicious payload.

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
e37bdbb88ff2bf41a7999216717a667cb09e808b58c62e34dcb04db74d963d19		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11599 bytes

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