Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57c6a44616b8351…

MALICIOUS

PDF

12.9 KB
MD5: 98df5946728d7b7bfb0bac7e71ed1663 SHA-1: 6fc4b994b0945a8e20f84887d064768d5e3adfca SHA-256: e57c6a44616b8351ea7747a7ec95cb9ecae919d0de9ae656ac852e05af21a7fb
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF document contains XFA forms which are known to be vulnerable to heap spray attacks. Heuristics indicate the presence of exploit code and embedded script payloads designed to leverage this vulnerability. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to download and execute a second-stage payload.

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
f9407083162f5e623e654a78b8af3b578ea8e0926503170a19b6c33750cec838		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12413 bytes

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