Malicious PDF — malware analysis report

Static analysis result for SHA-256 e34b7787f21866a7…

MALICIOUS

PDF

12.0 KB
MD5: b9c4c85428ff49db5eeace842142b510 SHA-1: 45fbf389450f976834af53d2a56e4418259ad6ff SHA-256: e34b7787f21866a7836dd8a315f3c989bd91c4a8de79d2f1c278f75cfc7663b1
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF file contains critical XFA heap spray exploit code and risky executable script, as indicated by multiple high and critical heuristic firings. ClamAV also detected it as Pdf.Exploit.Dropped-78. The exploit likely targets a vulnerability in Adobe XFA forms to execute a dropped payload, although the specific payload and delivery mechanism are not detailed in the provided evidence.

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.Dropped-78 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Exploit.Dropped-78
  • 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
2ac0822b6f7c3f0afa60fb2115536f8ef4546b082f02f236edf3a7445b51d5e4		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11486 bytes

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