Malicious PDF — malware analysis report

Static analysis result for SHA-256 45698d1acb8fd189…

MALICIOUS

PDF

11.6 KB
MD5: a6feb70c5ac5632e8ed671a623807b3c SHA-1: 57c79857251976b31b3dbe141fda3dd5f2718818 SHA-256: 45698d1acb8fd189c163e9727a9d2f1960952418b8e47a920bdab302c4bb32e0
128 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File

The PDF was flagged by a machine learning classifier with a high probability of being malicious and was also detected by ClamAV as Pdf.Exploit.Dropped-78. It contains an embedded script payload and an embedded file, indicating it is likely a dropper or exploit document. The ML classifier output and ClamAV detection strongly suggest this PDF exploits a vulnerability to execute a secondary payload.

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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • 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
9dddfa917956ec5a43bfe7a242e68c7fd6e3c535102f1497bd6898ef7bea2ebd		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11165 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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