Malicious PDF — malware analysis report

Static analysis result for SHA-256 605a264b7ed6222a…

MALICIOUS

PDF

164.7 KB
MD5: cfd9a7ef975ad831a2d321547c673159 SHA-1: 253bc459e131dae2843c2146d74a7eaf99223ec1 SHA-256: 605a264b7ed6222a616d882c839e06b41f3dbdcef2369c165399045d60aabf0a
60 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains an embedded file, indicating it is likely a dropper. The presence of XFA forms and embedded scripts suggests an attempt to exploit client-side vulnerabilities for execution. The embedded file 'embedded_file_obj0001.bin' is the primary indicator of a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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
  • Embedded script payload in PDF stream low 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.
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://www.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
03389830dd65f41b74a41b747b2b09c3b5a176f87cec566ec84def6b911febd0		 pdf-embedded-file PDF EmbeddedFile object 1 at offset 0x26F 25314 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 long base64-like blob(s).

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