Malicious PDF — malware analysis report

Static analysis result for SHA-256 f97b6c02efc1509a…

MALICIOUS

PDF

12.7 KB
MD5: 1c6a4ab9a5824febc9607d4a311b092c SHA-1: 2adc0b6acc209b7ca848b0e6a0274022ca0114c6 SHA-256: f97b6c02efc1509ab9bdcdf1b385e2e1bf49856c460bf19d7a6a3d20619a539c
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF document contains XFA forms with heap spray exploit code, as indicated by critical heuristic firings. This exploit code is designed to execute arbitrary commands. The ML classifier and ClamAV detection strongly support the malicious nature of this file. No specific malware family was identified, but the attack pattern is consistent with PDF-based exploit delivery.

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
56ca3aae319cc6790ea6602198a36a31ebf54cd12c084f2bb90bc7a537d63bfd		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12259 bytes

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