Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab8c36df233b0c72…

MALICIOUS

PDF

15.4 KB
MD5: 062fba35f12b4d1fc49530fe6420376a SHA-1: e1cbd57f1db758c8663e3f83630f11f2af44a497 SHA-256: ab8c36df233b0c7236d7dc6e8dbb55a11cd766723a41cd20e95cc45795ab8e0a
68 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by an ML classifier with high confidence. Heuristics indicate the presence of an embedded script payload and an embedded file, suggesting an attempt to exploit a PDF vulnerability for payload delivery. The embedded file 'embedded_file_obj0008.bin' is the primary artifact of interest.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • Embedded script payload in PDF stream medium 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.
  • 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/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
7ac21fafc59c8142e0b7d76fcf16a719489cab369376f1f98b5e33624b794981		 pdf-embedded-file PDF EmbeddedFile object 8 at offset 0xC6 15009 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 long base64-like blob(s).

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