Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c3c4df9c7d2d9be…

MALICIOUS

PDF

10.4 KB
MD5: 1b9794ab86fe61d470e75513ff555cf0 SHA-1: 28f8c48a8b5d0289a99a6fd739c6c48ddc044f00 SHA-256: 5c3c4df9c7d2d9be248ccf4210720bee06c886203a5edbdc38bdc127c1f76a49
110 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. It contains an embedded file, which is a common technique for delivering secondary payloads. The presence of XFA forms and obfuscated object names further suggests malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
9ef869abd1c9599af561faf34524955be2df156401a0f5dac2ea3b0ba445b3ce		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x78 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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