Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5f23669cb1851ec…

MALICIOUS

PDF

18.6 KB
MD5: 1819a5564de78b7d5994fca8961a74de SHA-1: c4d5d81c377da9c51cb8055de8979d229789e10d SHA-256: e5f23669cb1851ec3afdcd9da4693976eb0f7d2040ce3c1390531baa824606ad
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File

The PDF was flagged as malicious by multiple engines, including a high-confidence ML classifier and ClamAV, which identified it as Pdf.Exploit.Dropped-78. Static analysis revealed an embedded script payload and an embedded file, indicating the PDF is likely a dropper. The presence of XFA form elements and embedded URLs further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSEOF. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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
b9af33ddd33aaf54b1b8d0c2db087625c07c0c5b938d7e7efe59340a841516e3		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18284 bytes

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