Malicious PDF — malware analysis report

Static analysis result for SHA-256 465dd6a7c5d0cb7b…

MALICIOUS

PDF

12.0 KB
MD5: 4c7401c9c3c51f14e7be7e66464adb32 SHA-1: b8269683f5bf3bb8e35d2111560f79746df91af8 SHA-256: 465dd6a7c5d0cb7b9e217139dd1e1346eaaf38fec49afc6a1708aad3ae0e4e16
196 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Attachment

The PDF file contains XFA form elements with embedded JavaScript, triggering a heap spray exploit. This exploit is designed to download and execute a secondary payload, as indicated by the 'PDF_XFA_HEAP_SPRAY' and 'PDF_EMBEDDED_SCRIPT_PAYLOAD' heuristics. The ClamAV detection 'Pdf.Exploit.Dropped-78' further confirms its malicious nature. The exact payload and delivery mechanism beyond the initial exploit are not fully discernible from the provided evidence.

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
0ca6996978d14171ebd181565b94d2b0f8e94fc8e56884b35b7ae545bcda952c		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11527 bytes

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