PDF malware analysis — malicious · b915a032fe3c56fe

MALICIOUS

PDF

3.9 KB

MD5: 475d0321274e9cf020e3df2e27e38d9e SHA-1: 8dcf24a0198406b67a22e23725f5dfb309b7f8b9 SHA-256: b915a032fe3c56fe750af30b79b7c4590ab47f79e397d3dd1841ba6076f72ebe

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript streams, with one stream exhibiting significant obfuscation and the use of eval() and String.fromCharCode. These techniques strongly suggest the script is intended to download and execute a secondary payload. The presence of multiple JavaScript objects and the high obfuscation level indicate a malicious intent, likely to compromise the user's system. The specific URLs or commands executed by the script could not be fully reconstructed due to the obfuscation.

Heuristics 5

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.
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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `847435f181d7bb7eb1a0b8af5b7bc45c86182eeb36d60e3d609d815eeec14978`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	371 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `5d60666812d595c9ccdb0938d64d19b9970588b4a7c8f47368b29d0b653cfdce`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x247	5249 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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