Malicious PDF — malware analysis report

Static analysis result for SHA-256 59bc31395694d9da…

MALICIOUS

PDF

89.7 KB
MD5: 407dea9c2d630d196569a124446c5bc2 SHA-1: 1216e7e78d76c3b27eb477f408327d181fb030f1 SHA-256: 59bc31395694d9dac2b6a4ef9468f60d3023bc3463ef9f4f7756907ee8ca8443
212 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link

The PDF file contains critical XFA heap spray exploit code and embedded JavaScript, indicating it's designed to execute malicious scripts. The embedded script payload and XFA form heuristics strongly suggest an exploit targeting vulnerabilities within the PDF reader. The primary attack vector appears to be a heap spray vulnerability within XFA forms, leading to the execution of JavaScript.

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
c70cbb4fcebad4773ec811feaf69b8b2ba5f7d108ff40f62cdc2f5f0900afa98		 pdf-embedded-script PDF raw stream script payload at offset 0x44D 90744 bytes

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