Malicious PDF — malware analysis report

Static analysis result for SHA-256 4008892024879dc9…

MALICIOUS

PDF

19.2 KB
MD5: e259258a7342501bb2dc6c5738300d46 SHA-1: eca29f3210585f98fe5d9de25bfb9ae8078654a0 SHA-256: 4008892024879dc9824389cb9a0cde22a91c912a5b15e18b8b3f2a35a5972104
130 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics, including ML classification and ClamAV detection (Pdf.Exploit.Dropped-78). It contains an embedded file and an embedded script payload, indicating it's designed to deliver a secondary malicious component. The presence of XFA form elements and embedded URLs, though some are benign, are common in PDF-based attack vectors.

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
eb33b3d40d94625952ba070881eca57470a1f306692b460c4dc24c979b3954be		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 18890 bytes

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