Malicious PDF — malware analysis report

Static analysis result for SHA-256 6589c5da24d7a925…

MALICIOUS

PDF

114.7 KB
MD5: ea38e0a0dc40dd0459cc5c2d04a7379e SHA-1: b9da68cfb3263960e320bf71fa1963a4043fda8f SHA-256: 6589c5da24d7a925eb3b821dab2a52ec46a9a096d7ac763c9f8c1cc3f3d1ba05
208 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, obfuscated but identifiable as JavaScript, is triggered by an XFA event and likely performs a heap spray to achieve code execution. This is further supported by the 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics, indicating a malicious PDF exploit. The primary function appears to be the execution of a secondary payload.

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
6ab6c2628861bc755edf09565a4913db97de178dd2c60f77a3f692ded3d04fa0		 pdf-embedded-script PDF raw stream script payload at offset 0x23C 116700 bytes

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