Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a50b4bd1be9b7d7…

MALICIOUS

PDF

104.2 KB
MD5: 2bf6dc24a26b604dbcf0ba45edcbe32e SHA-1: 82cd9d4921ee012c251bd9b2bfc45790e28bf43b SHA-256: 2a50b4bd1be9b7d75280f7e6841962a960e983b5f93bde78d549616cb5a6aa00
280 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Exploitation for Public-Facing Application

This PDF file utilizes XFA forms with embedded JavaScript, triggering a critical heap spray exploit. The ML classifier and ClamAV detections strongly indicate malicious intent, specifically targeting PDF vulnerabilities. The embedded script is likely responsible for executing the exploit payload, leading to the observed malicious behavior.

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.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.
  • 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_pdf_script_0000023d.bin
56af92bd4459235544d8a5c89680bf9f777f43f559ca7bb31175855d0eb42712		 pdf-embedded-script PDF raw stream script payload at offset 0x23D 106011 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36370
Obfuscation or payload: unlikely

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