Malicious PDF — malware analysis report

Static analysis result for SHA-256 d19856a752f83428…

MALICIOUS

PDF

6.6 KB
MD5: f809a71d116dd0ad4a6c52cd5c166792 SHA-1: 0e5ead42ce7f88b1251ab0da756411589d9da2f4 SHA-256: d19856a752f83428ba46475bd04f75a33a74da34f37e940988906589e9111954
88 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an unescape() call and a high ML classifier score suggest malicious intent. The JavaScript is likely used to exploit a vulnerability within the PDF reader, leading to the execution of a malicious payload. The extracted artifacts, stream_002_off00000327.bin and objstm_0024_00.bin, are components of this malicious script.

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_off00000327.bin
12e386093824cfbe126095dff467884183e135c012a8037064c86557ed8748b3		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x327 1927 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
objstm_0024_00.bin
817c9053461b32414fabbdef939988a4db48eeb9d6757f9af1876bddf8611184		 pdf-objstm-decoded PDF /ObjStm 24 0 obj (inflated) 331 bytes

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