Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54aca6d9a682725…

MALICIOUS

PDF

92.9 KB
MD5: 1c8aec609e13c0a30c7703efe6a5ce7d SHA-1: 54cc1227b84aaaa06e2ed023d5963bc8d5228665 SHA-256: b54aca6d9a682725296639cb990266695094cdba596c821a4e0fe6f8b285940e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_UNESCAPE'. The ML classifier also flagged this PDF as malicious with a high probability. The presence of obfuscated JavaScript streams suggests an attempt to download and execute a second-stage payload. The document body is largely unreadable, providing no specific lure, but the technical indicators point to a malicious PDF exploiting JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • unescape() call high PDF_UNESCAPE
    unescape() found — often used to decode shellcode in PDF JS exploits
  • 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.
  • 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.
  • 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://www.bitstream.com
    • http://ns.adobe.com/xdp/
    • http://www.xfa.org/schema/xci/2.6/
    • http://www.xfa.org/schema/xfa-template/2.6/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_000.js
6a9c973f057d46a8b66b4fe5b8f34a082b1016ec31e72230896c0875755c96d0		 pdf-javascript-stream PDF /JS object 13 at offset 0x10531 27336 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
javascript_obj0013_001.js
638905e7a7489fd6a37b1c569278b1cba6cc8e9cf128ec76f3dd89423971b8eb		 pdf-javascript-stream PDF /JS object 13 at offset 0x10555 28247 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 2 eval/decoder/string-building token(s).
font_00_sfnt_off00000352.bin
a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x352 65932 bytes

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