Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dbb6dbcf70a4fe0…

MALICIOUS

PDF

114.7 KB
MD5: dafa29eb1ea92e66babb1658ab4af61e SHA-1: ac51db36db39c2b7e324246d250c3dc811c52f71 SHA-256: 5dbb6dbcf70a4fe04cbc1d34ffdb27ebd6a7a3fd922d2d3e61eec4ac18571ca5
208 Risk Score

Malware Insights

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

The sample is a PDF file that leverages XFA (XML Forms Architecture) to execute JavaScript. Heuristics indicate a heap spray exploit, a common technique for delivering malicious payloads. The embedded JavaScript, though obfuscated, appears to be designed to download and execute a secondary payload. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • 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_0000023c.bin
cd6b9c4d1e9f4ea864471ace4ad145b7fcfea1ecb5620e2dfafed7508428ad25		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 116702 bytes

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