Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5fa75f567c42903…

MALICIOUS

PDF

12.8 KB
MD5: ec4c90fa546c1417fe5fe659d30d8ca3 SHA-1: 3556a4b7e1a59dd24c907b41c69ddb830d410c92 SHA-256: f5fa75f567c42903cc15ada6b76f416925e287b27c04b7c299f707dabe817022
228 Risk Score

Malware Insights

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

The PDF sample contains critical heuristic firings for XFA heap spray and embedded script payloads, indicating exploit code execution. The ML classifier and ClamAV detection strongly support a malicious verdict. The embedded script likely downloads and executes a second-stage payload, leveraging the XFA form's scripting capabilities.

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
53c82ce57b9ca4ae2c77c18110e00b5100668130461f984230f805e05c850d31		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12334 bytes

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