Malicious PDF — malware analysis report

Static analysis result for SHA-256 1cc8ce1ec8d124ee…

MALICIOUS

PDF

12.7 KB
MD5: 414a7a0eb75e4f0bf7918cb6da8ccb96 SHA-1: 272bfe6c94989b84cda021025f83f7eaa91fc59f SHA-256: 1cc8ce1ec8d124eebbfa937704c44da4c4b94bbb2f15debc3c9f31afc3318732
196 Risk Score

Malware Insights

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

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. The critical heuristic 'PDF_XFA_HEAP_SPRAY' indicates the presence of exploit code designed to trigger this vulnerability. The embedded script payload and the high severity heuristic 'PDF_XFA_SCRIPT' confirm that risky executable script is present within the XFA form. This script is likely responsible for downloading and executing a second-stage payload, as indicated by the ClamAV detection signature 'Pdf.Exploit.Agent-6136306-0'.

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.Agent-6136306-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Agent-6136306-0
  • 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
abaf806f53c6752267683124bb0bf1fb0ce1ec9304d17713b87d5e5934cab858		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12213 bytes

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