Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2af7d7329d50272…

MALICIOUS

PDF

6.9 KB
MD5: e1f2e8f70bff7718a8928b0be41083a2 SHA-1: 5c265e2fc52cec4409c70fcacd64468cfc5cbd76 SHA-256: d2af7d7329d5027229d46dd5883e848887144684f48e925f51fdc1fb9d38d73e
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_UNESCAPE heuristic suggests obfuscation techniques are used within the script. The ML classifier strongly flags this PDF as malicious. The primary function of the embedded JavaScript appears to be the execution of malicious code, likely to download and execute a secondary payload, as suggested by the presence of obfuscated streams and the ML classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 5

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules. (matched inside decoded stream)
  • 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://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/xap/1.0/
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/pdf/1.3/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00000326.bin
5edb34de6ca5d712f48491026f2277696c5518f4dbce19c2baae41c7d1005654		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x326 1941 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
744ef541a1a292bb0ba48caf55cfcfa954076b713fb2c64a5a293540bbf823a5		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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