Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec4bce3e435853c…

MALICIOUS

PDF

88.7 KB
MD5: 7dd7209d7681e4a273811548eb93174e SHA-1: dc1f923d4efe53ab5eebfa65a969de27fb6c07fe SHA-256: 4ec4bce3e435853c0170f8d02bd633ca668121a36579431db3c0a3f71a9060c2
212 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.007 Command and Scripting Interpreter: JavaScript

This PDF file contains a critical XFA heap-spray exploit, indicated by multiple heuristic firings including PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT. The embedded JavaScript, found in the 'embedded_pdf_script_0000044d.bin' artifact, is responsible for executing the exploit. The primary purpose appears to be the delivery of a malicious payload, as suggested by the ClamAV detection name 'Pdf.Exploit.Agent-6136306-0'.

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
d7ddfc1f1944111f8bfdd6d6618567d17161e1df1e83323fc33dfd3bccd5dcaf		 pdf-embedded-script PDF raw stream script payload at offset 0x44D 89713 bytes

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