PDF malware analysis — malicious · 87aa5d0b228b874d

MALICIOUS

PDF

4.0 KB

MD5: 409ec639e30724dd4bc8f553c718804d SHA-1: 5a3eeae7f404be2026446b25e9eca06bfcc4cf58 SHA-256: 87aa5d0b228b874dc7a8ece9d216491b2d0913976cbdcc8ce113cf131cf095f5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript streams, with one stream exhibiting suspicious eval() calls and String.fromCharCode usage, indicating obfuscated code execution. The presence of JavaScript actions and streams strongly suggests the PDF is designed to exploit vulnerabilities or trick the user into running malicious scripts. The obfuscated nature of the script and lack of clear document body content prevent a more precise determination of the payload's intent, but the overall pattern points to a downloader or exploit delivery mechanism.

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_obj111611_000.js` `3ec7dc444541979f0c6b8feaab9a47aead4ef980733f4c027cc717dee833bf02`	pdf-javascript-stream	PDF /JS object 111611 at offset 0x197	258 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111612_001.js` `283d05aa428da5d14f27d9e4f57402794d15149b71c15e1c8373a5a24dc1d883`	pdf-javascript-stream	PDF /JS object 111612 at offset 0x268	5555 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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