Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3eb479ec87bda0c…

MALICIOUS

PDF

738.9 KB Created: 2010-09-25 16:27:12 +02:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 9.0.0 (Windows))
MD5: 2b0cd803b5d1745cc6175d493146fb31 SHA-1: 2380d055ba9d4e4a7ecc1498a19c06c863db7706 SHA-256: b3eb479ec87bda0c0aa9a15992507ba5695c3dacfd6979864ef0fed0e0cd246f
98 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF file contains embedded JavaScript, flagged by multiple heuristics including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL due to an eval() call. The ML classifier also identified it as malicious. The embedded JavaScript file, 'javascript_obj0001_004.js', is highly suspicious and likely responsible for downloading and executing a second-stage payload. The authoring application 'PScript5.dll' further suggests script-based malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6034

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.
  • Additional-actions dictionary low PDF_AA
    PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
  • 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://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
javascript_obj0001_004.js
26ef335839888f6a3c6f60d76d42e63df3bee90378f080fb4e2f32fdc8f5c890		 pdf-javascript-stream PDF /JS object 1 at offset 0xF 1558 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact contains 8 eval/decoder/string-building token(s).
icc_00_off00031c3d.icc
2b3aa1645779a9e634744faf9b01e9102b0c9b88fd6deced7934df86b949af7e		 pdf-icc-profile PDF ICC profile at offset 0x31C3D 3144 bytes
font_00_sfnt_off000aa8f0.bin
db242e9120075ce923bcec904744b6c0b656a7f3e2a520b726afaa10afaf4456		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA8F0 22020 bytes
font_01_sfnt_off000adef8.bin
07f80ebbfc3e47e90343694971d7b5524a77df3fd763fdb1e7528f20643d489c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADEF8 18436 bytes
font_02_sfnt_off000b09e4.bin
835130445181dc62fea7620adf52540d107737f272975afc1125e8257448cbb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB09E4 25384 bytes
font_03_sfnt_off000b4bb2.bin
f15d53ff0ddd4d835a7b0664df682c523b76603168cb29fcff868b4c98e648a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4BB2 22480 bytes

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