Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c778a7ed45fff5…

MALICIOUS

PDF

11.9 KB
MD5: 5b7b1a75bab19a85946b72c655d20fc1 SHA-1: 5af22ecdf1e89a2b2b22f02af192d17ee471934c SHA-256: f8c778a7ed45fff5637d0dff2ce36ba0e98c5beef73abdcd45d862ee32814ad8
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1059.007 JavaScript/VBScript

The PDF document contains XFA forms with critical heap spray exploit code and executable scripts, as indicated by multiple high and critical heuristic firings. ClamAV also detected this as Pdf.Exploit.Dropped-78. The embedded file and script suggest the document is designed to download and execute a second-stage payload.

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
5c8318d68e200518750787c90fd1905d826920784fc8cdf2c91ea931c8b6d186		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11471 bytes

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