Malicious PDF — malware analysis report

Static analysis result for SHA-256 ceca8f573258dfe1…

MALICIOUS

PDF

399.7 KB Created: 2005-11-10 15:27:08 +02:00 Authoring application: Acrobat PDFMaker 7.0 for Excel (via Acrobat Distiller 7.0 (Windows))
MD5: 0461126f0f5090906956ff8d4f800239 SHA-1: d1ad0c2056a2ca693fada54e46e440b41c84d9c5 SHA-256: ceca8f573258dfe1190d54fcb4b1a67ac3f0c4a593e33cafb39bc473a94897c3
90 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains embedded JavaScript with an eval() call, indicating an attempt to execute arbitrary code. The ML classifier also flagged this PDF as malicious. The presence of JavaScript actions and embedded JS streams strongly suggests the document is designed to download and execute a second-stage payload. The external URI http://www.pdfill.com is also noted.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5026

Heuristics 6

  • eval() call high PDF_EVAL
    eval() found — commonly used for obfuscated exploit execution (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.
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.pdfill.com)/S/URI
    • http://www.pdfill.com
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://ns.adobe.com/pdf/1.3/
    • 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/pdfx/1.3/

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_000.js
15689f302e582c730e2957af9f693527bed5d4b0c0400330afa9ba85ee307ff3		 pdf-javascript-stream PDF /JS object 1 at offset 0xA 12114 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 10 eval/decoder/string-building token(s). Carved artifact contains 3 long base64-like blob(s).
icc_00_off000346e5.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x346E5 3144 bytes
font_00_sfnt_off000091a6.bin
195a27e670c6e0b8b7dbcf792a887cfa389403d4184d0b2a7c53b6383fc0521a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x91A6 21392 bytes
font_01_sfnt_off0000b206.bin
f65184fc63ce46829852f1227bc0f1b5d4675a3e420d5887c9a5e7c4cddbfbab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB206 23016 bytes
font_02_sfnt_off00035244.bin
a6bc7b2701bb0f6b886078019493ac18d9a4d6e979560d7f941badaae353f225		 pdf-font-stream PDF embedded font (sfnt) at offset 0x35244 46304 bytes

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