Malicious PDF — malware analysis report

Static analysis result for SHA-256 feffd6d9ba144969…

MALICIOUS

PDF

12.1 KB
MD5: 1958fae234e264f3f8b08362f931aee4 SHA-1: 81b4b08ab34cb222275ead62c71c0c8c0c2000cb SHA-256: feffd6d9ba144969e8e6af7635a8bc575e0d9b55b28715411f6d89cfe370e64c
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File Execution T1204.002 Malicious File Execution: Malicious PDF

The PDF sample contains critical XFA heap spray exploit code and risky executable scripts, as indicated by multiple high and critical heuristic firings. The ML classifier also strongly flagged this PDF as malicious. The embedded file suggests a dropped payload, consistent with the ClamAV detection of 'Pdf.Exploit.Dropped-78'. The script's intent appears to be the execution of this embedded payload.

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.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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.
  • Embedded file low PDF_EMBEDDED
    PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
  • 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_file_obj0008.bin
c8319fcf8555ace19ceaca21b35ac37f49919f9cdab494eb6a999cebe9db7bbc		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11676 bytes

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