Malicious PDF — malware analysis report

Static analysis result for SHA-256 0aa5950c6e45efe5…

MALICIOUS

PDF

10.4 KB
MD5: e2f15522277551368c7e7dba5bc6df5c SHA-1: de1d8e5e42eb4c5fb22f96ec8798cc8c26886f5f SHA-256: 0aa5950c6e45efe533a8aba8952951fd023a70900b95a68020e6e7fa1011abd1
110 Risk Score

Malware Insights

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

The PDF file contains an embedded object that is flagged as malicious by ClamAV and an ML classifier. The presence of an embedded file and XFA form suggests an attempt to exploit a PDF vulnerability for client execution, likely delivered via spearphishing. The embedded file 'embedded_file_obj0001.bin' is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • 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/xci/1.0/
    • http://www.xfa.org/schema/xfa-template/2.4/
    • http://www.xfa.org/schema/xfa-data/1.0/
    • http://ns.adobe.com/xtd/
    • http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
embedded_file_obj0001.bin
71baf7ade0ade97b3b3ab88bed0fcde0876cb41003874f84ed29fd613975539d		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x80 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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