PDF malware analysis — malicious · fe9f617ba3c64b50

MALICIOUS

PDF

53.1 KB Created: 2008-07-21 11:01:03 UTC Authoring application: pdfFactory Pro www.fineprint.com.cn (via pdfFactory Pro 2.10 (Windows XP Chinese))

MD5: 04e1a78e9893b4f211ba73a87c308bb2 SHA-1: 098d8c5f1c55cc0af9c778be72e78b0152ebff98 SHA-256: fe9f617ba3c64b500670494889a9772209be727f347a2e37ca352a4e92ed7e9e

116 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File

This PDF file contains embedded JavaScript that utilizes eval() and String.fromCharCode, indicating obfuscated code execution. The ML classifier strongly flagged this as malicious. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, though the exact mechanism is obscured. The presence of a suspicious URL associated with the document further supports malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9957

Heuristics 7

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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.
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)
External URI info PDF_URI

PDF contains an external URL action
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.fineprint.com.cn)/S/URI
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/xap/1.0/
- http://purl.org/dc/elements/1.1/
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0037_000.js` `977ccac9cdd11dcd6a26a6922b7faacb998b80b243941398e838db190156c66e`	pdf-javascript-stream	PDF /JS object 37 at offset 0xF98	7672 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 hex-escaped blob(s).
`font_00_sfnt_off000031f9.bin` `6dc1f90496a63589ad75c7eca5e9d80e141a5b19743a347bd5bf3150bc8bb585`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31F9	17152 bytes
`font_01_sfnt_off00005f3f.bin` `4435506ae63b4783a85e83f3f9b500375165448360eef1ade3760ec955b5a7c2`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F3F	22616 bytes
`font_02_sfnt_off00009a43.bin` `13c47c7ea8447f95875a3bded169065d11ed713b7ba544ed08c5e8adfc0047e9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9A43	21840 bytes

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