PDF malware analysis — malicious · f63f64753f9ce78b

MALICIOUS

PDF

2.6 KB

MD5: 988190836d4fa905ec61ccede34a98c6 SHA-1: c891658121b045f60da46ac28522ebfc042d1a1a SHA-256: f63f64753f9ce78b73ca836c4d04ff2a99699bc11470e28be7584d3cf1e66ce5

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and PDF_FROMCHARCODE. The JavaScript stream is obfuscated and utilizes eval() and String.fromCharCode, suggesting an attempt to hide malicious code execution. This obfuscated script is likely responsible for downloading and executing a second-stage payload.

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` `754df645a27074247de27869999f90efbd7a651c5cee903738c32f417efae57f`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	2531 bytes
`javascript_obj111712_001.js` `72cd80c71dfa2f5c9b14ecdbf2dd7ef5c9bc048ed61211f6e040074a26cf1fab`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x887	533 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).

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