Malicious PDF — malware analysis report

Static analysis result for SHA-256 7838056b42ec12fa…

MALICIOUS

PDF

105.2 KB
MD5: 0875f4aa3e717066757414a4b62725b8 SHA-1: 5db87252a7d87fd9015bde591128b508aecab1fc SHA-256: 7838056b42ec12fa46f05b9ae56f0f3fcd7d46b2626a7297ce370f631a5f3735
268 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The embedded JavaScript, identified by multiple heuristics and ClamAV, is designed to trigger this exploit. The script's obfuscated nature and the heap spray technique suggest it's intended to download and execute a second-stage payload, characteristic of a malicious dropper.

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.
  • XFA form low PDF_XFA
    PDF uses XML Forms Architecture — can contain script logic
  • Embedded script payload in PDF stream low 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.
  • 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
70621d2ae4c6ae6b9080703c34da6d6b9337e447e0d74701447f81450c386f41		 pdf-embedded-script PDF raw stream script payload at offset 0x23D 107049 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36370
Obfuscation or payload: unlikely

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