PDF malware analysis — malicious · 425620e18aae4d7f

MALICIOUS

PDF

4.1 KB

MD5: 8214a8aa298dd1da848822886174af6a SHA-1: fb454fbb93ebaaed00a97a5ef9fd5b9adeb9ccbd SHA-256: 425620e18aae4d7fcb5a809dd2e8559f9637fa5444ee06bbbdc3d71194e116d1

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 and PDF_JS. The presence of PDF_EVAL and PDF_FROMCHARCODE suggests that the JavaScript is obfuscated and uses eval() to execute code. The extracted JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', are likely responsible for the malicious functionality. The obfuscation and use of eval() point towards a downloader or dropper mechanism, aiming to fetch and execute further malicious content.

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` `a376b1cbba27e91b3e38057a4464a772a35e44ec8e423fc39b2e2ace36f448e1`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6397 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` `295fddfffe9928f7521db0f39152b3e57a18f2a2a9ca1a029e1d5860048e3569`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3644 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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