Malicious PDF — malware analysis report

Static analysis result for SHA-256 51bee9f26358f821…

MALICIOUS

PDF

11.8 KB
MD5: bfaf9c5c48c52167c9bdf7e982c6d541 SHA-1: e6afc2221e781fb9c6f88290ead528752db9079c SHA-256: 51bee9f26358f8215cfe70b871017f20a715eee9f44297f24f9d8f52d5e96ff9
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution

The PDF file contains XFA (XML Forms Architecture) which is known to be vulnerable to heap spray attacks. Critical heuristics indicate PDF_XFA_HEAP_SPRAY and PDF_XFA_SCRIPT, suggesting the presence of exploit code within the XFA form. ClamAV detection of 'Pdf.Exploit.Dropped-78' further confirms its malicious nature. The embedded file and script payload indicate the delivery of a secondary malicious component.

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
db1898ad375fe9da78326422bd5701d7d68b696a2669a0871f63abd9e89c429f		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11363 bytes

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