Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb005a9ee534e4f…

MALICIOUS

PDF

10.4 KB
MD5: 47ea9039af06b7e9b523c9f895bc4b90 SHA-1: 010ef41bb4c2f5f7fafc272147bd6e96b22b397c SHA-256: 6fb005a9ee534e4fa9df5485a02bb8f7fffc204d7df40d78e26d64879c124dde
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1140 Deobfuscate/Decode Files or Information

The PDF document exhibits high-severity heuristics for obfuscated name objects and ML classification, indicating malicious intent. It also contains an embedded file, likely a secondary payload. The presence of XFA forms and obfuscated objects suggests an attempt to hide malicious content, aligning with techniques for deobfuscation and delivery via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
  • Hex-obfuscated structural name object high PDF_OBFUSCATED_NAME_OBJECT
    A structurally-dangerous PDF name (e.g. /OpenAction, /Launch, /AA, /EmbeddedFile, /SubmitForm) is written with #XX hex escapes to evade string-based scanners. Legitimate producers write these names literally; hex-encoding them is a deliberate obfuscation technique.
  • 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
fc8ce4bce3f2620984577e34fac80666e94e2412fa4dd2db49f1959e99c15c06		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x76 13408 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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