Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb08ad7c98baba94…

MALICIOUS

PDF

104.2 KB
MD5: 1c2b33ea0617b366f7d2bc5ace5f5d8f SHA-1: 12e2aaf38a3845c0d7b70e9cbb38fb180be7055b SHA-256: fb08ad7c98baba94d4704d03999cfd978a065d34817bf1d5555e44d01431c10a
278 Risk Score

Malware Insights

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

The file is a PDF containing XFA (XML Forms Architecture) which is known to be a vector for exploits. Heuristics indicate a critical PDF_XFA_HEAP_SPRAY firing, suggesting the presence of exploit code designed to trigger a heap spray. This is further supported by critical ClamAV detections identifying it as a PDF exploit. The embedded script payload and XFA script confirm the malicious intent to execute arbitrary code. No specific family could be identified, but the attack pattern is clear.

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
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • 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.
  • 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_pdf_script_0000023d.bin
f0c7d444e6daf042165b0df1a1ad3a6c3d1f8c1ba3dd8875f6d72928e199c8d6		 pdf-embedded-script PDF raw stream script payload at offset 0x23D 106007 bytes
Detection
ClamAV: Pdf.Exploit.Agent-36370
Obfuscation or payload: unlikely

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