PDF malware analysis — malicious · ebae8e76839b0abe

MALICIOUS

PDF

4.1 KB

MD5: 5a56b180d39bcfdc3a442050453d27c8 SHA-1: e593ffae64ed8557bc230e335cf2968521ce9643 SHA-256: ebae8e76839b0abe6d8ad72372bd96a1e5b3914d4f119a507874d71fd9aa0bf6

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1059.003 Command and Scripting Interpreter: Windows Command Shell T1059.007 Command and Scripting Interpreter: JavaScript/TypeScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The presence of `eval()` and `String.fromCharCode` suggests code obfuscation and dynamic execution. The extracted JavaScript files, particularly 'acroform_b64_00.js', are likely responsible for downloading and executing a secondary payload. The overall attack pattern points to a malicious PDF designed to exploit vulnerabilities or trick the user into running arbitrary code.

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` `38a512c2fb3e8e9ac93de28c82d7cb9cc896e909347bd7e4ee4500f9685e4673`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6521 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` `a5c2a04ebc95b9fcae91b5b9755262601d92cbfed581b138cf312e571f510ad9`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3736 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 5 long base64-like blob(s).

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