Malicious PDF — malware analysis report

Static analysis result for SHA-256 c923a6ee94a2890e…

MALICIOUS

PDF

12.8 KB
MD5: 1956d021415d8f292608606333e7cc55 SHA-1: d601257d967fe0b85d5285478a4c5d344b13ca04 SHA-256: c923a6ee94a2890ef16ca9336dfc7d7d4f3e29021b869242eea4ab5cb7151240
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious JavaScript T1204.002 Malicious JavaScript

The PDF file contains XFA forms with heap spray exploit code and executable JavaScript, as indicated by critical heuristic firings. This suggests the document is designed to exploit a vulnerability in PDF viewers that support XFA forms, likely to download and execute a second-stage payload. The embedded URLs do not appear to be directly malicious but are related to XFA schema definitions.

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.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
dbf4af8276d8f55b566bab7ce6609bfe09bc82248a040889631af5a4c61e7ca3		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12321 bytes

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