PDF malware analysis — malicious · 5a12b78c1731babf

MALICIOUS

PDF

4.1 KB

MD5: 095eab491d93bad5f490314a96596856 SHA-1: 992a52796f0db5c034521ad390fe01c81f512b1d SHA-256: 5a12b78c1731babf7ad9246dbf473456d4fa6a969b04e5ba03896b2b714edae0

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File Execution: Malicious JavaScript

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The deobfuscated JavaScript stream, 'acroform_b64_00.js', suggests the execution of eval() and String.fromCharCode, common techniques for obfuscating malicious code. This script is likely responsible for downloading and executing a secondary payload. The presence of these obfuscation techniques and the execution of JavaScript point towards a malicious PDF designed for exploitation.

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` `b47360bc2c9e877d046ec13c2c4330c263e225626d70d43a19b9694496cb8c69`	pdf-javascript-stream	PDF /JS object 13 at offset 0x368	6389 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` `613a17bf880b76e5875d4facaa36c640a07a3c51e864d65b20463bb1c183c553`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x99D	3637 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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