PDF malware analysis — malicious · 3d7cd47505858a81

MALICIOUS

PDF

4.0 KB

MD5: 45a43a5548d0f798b9aca364ae5a6543 SHA-1: e443280f6efe498dc7edc12ffe22a27f72d01491 SHA-256: 3d7cd47505858a8134776ae13a475475a0d3edf353c4410b688bd9beb1da2086

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an eval() call and String.fromCharCode within the decoded JavaScript stream suggests code obfuscation and dynamic execution. This pattern is commonly used to download and execute a second-stage payload or to phish for user credentials. The extracted JavaScript files, particularly 'acroform_b64_00.js', show signs of obfuscation and contain suspicious function calls.

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_obj0013_001.js` `63517b879a04bae139c39cca85766447044ca15f7a7f9bde4e152ab5d1febb13`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6309 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`acroform_b64_00.js` `5f61d5144edeac8c3db7d27337f7b65c08d194202fdf3cbcfbfefc0352d29088`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3578 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 base64-like blob(s).

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