PDF malware analysis — malicious · a5628cd0e1d80680

MALICIOUS

PDF

1.5 KB

MD5: d2c4fa8d5f1737394e3284e6372b9622 SHA-1: 9f0a17f0ff1c79716f3ae1cc8be28a79e910d17d SHA-256: a5628cd0e1d80680b78d1e025825aa04fb2c929ddb09f1502597a3aa8a4031ea

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript actions and streams. The JavaScript is obfuscated using unescape() and String.fromCharCode, suggesting an attempt to hide malicious code. The primary function of the embedded script appears to be the execution of further malicious content, as evidenced by the 'Suspicious extracted artifact' heuristic. No specific URLs or network indicators were extracted, but the presence of obfuscated JavaScript strongly suggests a malicious intent to download or execute additional payloads.

Heuristics 5

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `e00cfc2ad3a6615a57d498b4b94a7ee2aa20fbeb875970e68d1f5eeac2af90d0`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	3564 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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