Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97597a5fa206afb…

MALICIOUS

PDF

12.1 KB
MD5: 648a9749ba1b5c3d2c9657991ab95218 SHA-1: 011fbf4ed56f9fdb93b24bb6f7a1eaff1733a1fb SHA-256: c97597a5fa206afb396313ce77e7c9626e7a5f29ff55c966ad0b062b573cb381
196 Risk Score

Malware Insights

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

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The heuristic firings indicate the presence of XFA heap spray exploit code and embedded script payloads. This suggests the file is designed to exploit this vulnerability upon opening, likely to download and execute a second-stage payload. The embedded file further supports the malicious intent.

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
46e423af41a2731cdc9cdadfbeee3dffad2c00ac08b49024d39eda3fc813435b		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11611 bytes

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