Malicious PDF — malware analysis report

Static analysis result for SHA-256 9171a2fd6b0895e1…

MALICIOUS

PDF

12.8 KB
MD5: 3f296c30d479b6e031b229fab555b9e8 SHA-1: f3cc1c324857ea9031dc29606caef96bb9616aa5 SHA-256: 9171a2fd6b0895e1dd05bda40a6a7f28af53798f2b41fcbdd3b503a2f026d4b2
196 Risk Score

Malware Insights

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

The PDF file contains XFA form elements which are known to be vulnerable to heap spray attacks. The heuristic firings indicate the presence of XFA JavaScript heap-spray exploit code and an embedded script payload. ClamAV also detected this file as Pdf.Exploit.Dropped-78, confirming its malicious nature. The primary attack vector appears to be exploiting a vulnerability within the XFA form processing.

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
d3b29c89ed560440d27867e5152fe8cb3e4422452bb1b3fc6167f7c3db0adb1f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12334 bytes

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