PDF malware analysis — malicious · 8edf0b2726e738a0

MALICIOUS

PDF

294.4 KB Created: 2007-03-23 14:48:51 +11:00 Authoring application: PScript5.dll Version 5.2.2 (via Acrobat Distiller 6.0.1 (Windows))

MD5: a1c44bbec66264c778e3e18d41054caa SHA-1: 3a0e4715a07f23401df1bbdac851ffddf69b8c2b SHA-256: 8edf0b2726e738a096e54c559a89766e371c807d2eecffe4efcb29630fc8f333

112 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by heuristics for eval() calls and String.fromCharCode. The ML classifier also strongly indicates maliciousness. The embedded JavaScript stream, named 'javascript_obj0026_003.js', is the primary indicator of malicious activity. It is highly probable that this script is designed to download and execute a secondary payload, a common technique for initial access.

Machine Learning

Nyx PDF Classifier malicious score 0.9377

Heuristics 8

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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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.)
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape 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/iX/1.0/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/
- http://purl.org/dc/elements/1.1/

Extracted artifacts 16

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`PM.joboptions` `5cf97cfee76c3bcd5d889b3138e05d6571e7d097b173dd3eee4be6813c9dd743`	pdf-embedded-file	PDF EmbeddedFile object 92 at offset 0x11681	12758 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 12 long base64-like blob(s).
`javascript_obj0026_003.js` `f7665c911b4fe669917f68e2da14f3cf39463704147618b289f172cc9aa267aa`	pdf-javascript-stream	PDF /JS object 26 at offset 0x1DD8	9275 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`font_00_cff_off00013b0e.bin` `66b568c63de9f6bf19ac6b22e6bb9fbdfcbfdb789a7d8ef22fe68a20c41b1738`	pdf-font-stream	PDF embedded font (cff) at offset 0x13B0E	1720 bytes
`font_01_cff_off00014180.bin` `caad8bd8dc8464a6915782714ecde11465790f5f781f4dc806026ae9d0ba8630`	pdf-font-stream	PDF embedded font (cff) at offset 0x14180	824 bytes
`font_02_cff_off00014505.bin` `a6dc06179917b7934eebd7c472604ce3ad1289f79feb0b8bdc540354bb9baa26`	pdf-font-stream	PDF embedded font (cff) at offset 0x14505	6344 bytes
`font_03_cff_off00015a8a.bin` `7b72eff1c510ca6810551336772e863c9c20d59276d90f71f775be4acdc1d257`	pdf-font-stream	PDF embedded font (cff) at offset 0x15A8A	3047 bytes
`font_04_cff_off000165af.bin` `72c500ca285983f4c83c79052fb4a04561231a16de22ad5623f99d4d43b274c4`	pdf-font-stream	PDF embedded font (cff) at offset 0x165AF	5495 bytes
`font_05_cff_off00017813.bin` `30d50c85aa709192f00017e6ee6aa5bb5996de9f273b451a1004ccf4e6e74e67`	pdf-font-stream	PDF embedded font (cff) at offset 0x17813	16542 bytes
`font_06_cff_off0001a82b.bin` `6a8b0673f0b92cc505847e4335f8bfb18f60b3619c7f5fc73b92be209fc81ba6`	pdf-font-stream	PDF embedded font (cff) at offset 0x1A82B	9614 bytes
`font_07_cff_off0001c769.bin` `f6d8880735d2495d620eb78f9743bb32fac909cb58fb42398775c8f2f7b3e375`	pdf-font-stream	PDF embedded font (cff) at offset 0x1C769	154 bytes
`font_08_cff_off0001c856.bin` `6e066f27adb83acaeec904cd9ff2f04cbea0df0bb14f920eebed36485a5ff0e7`	pdf-font-stream	PDF embedded font (cff) at offset 0x1C856	6513 bytes
`font_09_cff_off0001df4e.bin` `fa6da6454e2d77712ddfcd79b59850d36a89ad730d409a7e30e49c60eecb988b`	pdf-font-stream	PDF embedded font (cff) at offset 0x1DF4E	7807 bytes
`font_10_cff_off0001fa86.bin` `71ed8cb41f1ee45a44bacb6f848f625ff0ccf4d62fce8ecf6edf18797833cd24`	pdf-font-stream	PDF embedded font (cff) at offset 0x1FA86	1894 bytes
`font_11_cff_off00020120.bin` `0888fcd61d63d6bc513bc23b06a814b268e4aa85ff0e303a7ed5681b33697a06`	pdf-font-stream	PDF embedded font (cff) at offset 0x20120	8886 bytes
`font_12_cff_off00021d14.bin` `29ed16f03b494a95fb0fb1dcb077a3dc38091c4a63a1cff67d61e840d5ff8150`	pdf-font-stream	PDF embedded font (cff) at offset 0x21D14	1157 bytes
`font_13_cff_off000220b7.bin` `e95d37a17f542c3e361adbed2914a0ea743a38ce27798260017228fea29ad572`	pdf-font-stream	PDF embedded font (cff) at offset 0x220B7	4704 bytes

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