Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be8b5f98101bcc6…

MALICIOUS

PDF

19.1 KB
MD5: 2d59f2b6a6da4798e63544df3450c127 SHA-1: 708c4c2cd2f49b6ddd208fff4e18fca70ced93e4 SHA-256: 9be8b5f98101bcc69ae24147e01a80af00703220dfeb59ca506f515478e3876d
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.002 Spearphishing Attachment

The PDF was flagged as malicious by ClamAV and an ML classifier, indicating it contains exploit code. The presence of an embedded script payload and an embedded file further supports this. The document body contains obfuscated JavaScript, likely intended to download and execute a second-stage payload, though the exact functionality is obscured.

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
bc7b6c57c686b8926fa86e198244ee77dfff1c9600e2ac674323f9b8972ee2da		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18769 bytes

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