Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c21c674f405a4f5…

MALICIOUS

PDF

11.7 KB
MD5: dce7da78a23001261f871853c8a0fad9 SHA-1: 13a1851829aa0e189fb3c89b5580661e67c051d2 SHA-256: 0c21c674f405a4f5009c664a28a1af6a3c83d9fe24cb8c652a2f7ab4e7637629
118 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV, specifically flagged as 'Pdf.Exploit.Dropped-78'. It contains an embedded script payload and an embedded file, indicating it's designed to exploit vulnerabilities and deliver a secondary payload. The presence of XFA forms and embedded scripts suggests a common technique for exploiting PDF viewers.

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 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
  • Embedded script payload in PDF stream low 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.
  • 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
787a0d0e6e446eaadbbe3a02b671b550cfbdaaff1a02fd3ce25cc2cbf023bfcb		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC8 11230 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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