Malicious PDF — malware analysis report

Static analysis result for SHA-256 522894d7655cd1cb…

MALICIOUS

PDF

88.5 KB
MD5: cd0b3673e2afa27b54fcda87da32f3ea SHA-1: 0b98c4c65e0e5b47cb3f0daa8fa00a16f7e999d7 SHA-256: 522894d7655cd1cb28079de4b01e1093ab79c2bcd9adf5599f58d47344f78b0f
242 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Compromise User Execution: Malicious File

The PDF file contains XFA form elements and triggers embedded JavaScript, which is flagged as a heap-spray exploit. This JavaScript is likely designed to download and execute a secondary payload, as indicated by the critical heuristic firings for XFA heap spray and embedded script payloads. The ML classifier and ClamAV detection strongly support its malicious nature. No specific family could be identified.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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
ef56f7bde3812856b0dc162d4054073268139014e23d2b1743b40d72d0318016		 pdf-embedded-script PDF raw stream script payload at offset 0x44D 89452 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.