Malicious PDF — malware analysis report

Static analysis result for SHA-256 efd010cd0a5982dc…

MALICIOUS

PDF

12.7 KB
MD5: 1d510a12abba23aa5ec6e561737c0207 SHA-1: fa8d985b5596d62a2ad8fb273c2bb2bbe68175d8 SHA-256: efd010cd0a5982dcdee31b6ce74df5a7cd785d54bff2fc6d67a8bcb9cc8b15c5
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

This PDF file contains critical XFA heap spray exploit code and risky executable script, as indicated by multiple high and critical heuristic firings. The ML classifier also flagged it with high confidence. ClamAV detected it as Pdf.Exploit.Agent-6136306-0. The embedded script likely downloads and executes a second-stage payload, although its exact functionality is obscured by the exploit code.

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
76fc3b8888edc09d2fee17b9aaabdb32a307be42fe29be0f248524080572760d		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 12273 bytes

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