Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce41c1661fe91602…

MALICIOUS

PDF

70.1 KB
MD5: f3e4d348e153cd807354a5a4f57067c5 SHA-1: 7716e894c4cb9e80d22ecc339c65ade044d298a9 SHA-256: ce41c1661fe91602bb41e168f213303bb25a78dd7845e7a6be71aeea8baf4ce7
96 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The 'PDF_UNESCAPE' firing suggests obfuscation techniques are being used within the JavaScript. The ML classifier also strongly flagged this PDF as malicious. While the document body is largely unreadable garbage, the presence of JavaScript and the ML score point towards an exploit attempt, likely to download and execute a second-stage payload. The specific URLs found are not directly indicative of malicious activity but are included as potential indicators.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0013_000.js
9ed8362bdf4f7a7f5ce22e9edbcbbad270423057015aa69afe5f812ca8f79efb		 pdf-javascript-stream PDF /JS object 13 at offset 0x10531 3967 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).
font_00_sfnt_off00000352.bin
a8f4d9b7d604c3c8a0bf3f9a31b9e952d467f98d118fdc784d95d689a14d8a33		 pdf-font-stream PDF embedded font (sfnt) at offset 0x352 65932 bytes

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