Malicious PDF — malware analysis report

Static analysis result for SHA-256 0778c1fa63b382df…

MALICIOUS

PDF

10.5 KB
MD5: da4ffaddc7cc4dda08e7db12d4b24f40 SHA-1: 98afb2a80d6f642fb79f573a3d7ed75f8d32d7ee SHA-256: 0778c1fa63b382df6514992bd96e200912eb596afdbe1e9b8e54b1b121fa30df
110 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious due to obfuscated objects and an embedded file. The presence of XFA forms suggests the potential for JavaScript execution, which is commonly used to download and run secondary payloads. The embedded file is the primary indicator of malicious content.

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
8217b611f2f61809890382d8659f8b2d1ae3f4d8d17c7730a0a7efbd19637a6d		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x7F 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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