Malicious PDF — malware analysis report

Static analysis result for SHA-256 a446db6bf20896fc…

MALICIOUS

PDF

12.2 KB
MD5: a1ab006d7923d62e3ec58c754cb607ff SHA-1: 0877c8e01c40b465f894c80924fd39aaa4fd20bd SHA-256: a446db6bf20896fca3af43c02cd5ddb579f847cc62d5554f5c48a6689fc6f278
226 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution T1566.001 Phishing: Spearphishing Attachment

This PDF file contains XFA (XML Forms Architecture) which is known to be a vector for exploits. The critical heuristic 'PDF_XFA_HEAP_SPRAY' indicates the presence of exploit code designed to spray the heap, likely to facilitate code execution. The embedded script payload and ML classifier further confirm its malicious nature. ClamAV detection 'Pdf.Exploit.Dropped-78' directly identifies it as a known malicious PDF exploit.

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
a3cb06f9a376d9ab3dfc525e4f0f12bfca4fd5952e544c8641769036832227c9		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11753 bytes

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