PDF malware analysis — malicious · b8772bff67b54536

MALICIOUS

PDF

4.0 KB

MD5: bdee54b3ed5a4941b0b4bca175d0526d SHA-1: 25761f10f78a3f5e2b91c14ac68214fb1d3219db SHA-256: b8772bff67b54536f531254dcf7e7dd1e37645e1406cc9466b49bb563cab9f93

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1027 Obfuscated Files or Information

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream exhibits obfuscation, with `eval()` and `String.fromCharCode()` calls detected. Two JavaScript files, 'acroform_b64_00.js' and 'javascript_obj0013_001.js', were extracted. The obfuscated nature of the script suggests it is designed to download and execute a secondary payload, a common technique for initial access.

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` `5f22077993edbbe71b00e559d096b2f34d4ec2cbd316b61281c396d8b8348094`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6381 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` `326e0b849e5cba32570407cf0f047a5562629a53557e8f1df2f5100f7b43dd7b`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3632 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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