Malicious PDF — malware analysis report

Static analysis result for SHA-256 9883bfbf0f6f30c9…

MALICIOUS

PDF

88.5 KB
MD5: 531b26b21f1540973a4d054a914640b6 SHA-1: f24874ccb2d15e3f6deb0fe14db8b03d97d60857 SHA-256: 9883bfbf0f6f30c939412f8105139f69aa1eb048d00da8a03013efd30bdb5d45
212 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.007 Scripting: JavaScript

The PDF file contains embedded JavaScript within an XFA form, which is flagged as a heap-spray exploit. This script is designed to execute malicious code, likely leading to further compromise. The embedded script payload and XFA heap spray heuristics strongly indicate an exploit attempt. No specific family could be identified, but the attack pattern is consistent with known PDF-based exploit delivery.

Heuristics 9

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • AcroForm button with action trigger low PDF_ACROFORM_BUTTON
    PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
  • 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_0000044d.bin
d935a8c14c19f159464c975494940c0c6b755219219fddd62b0b5f71e61ee276		 pdf-embedded-script PDF raw stream script payload at offset 0x44D 89477 bytes

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