PDF malware analysis — malicious · f32d78e68d2cf40d

MALICIOUS

PDF

926 B

MD5: cb3b3462cdbac21879c6bc2821e5257c SHA-1: 1eda31658d5da997a2696bf529c0a3c408cc70c8 SHA-256: f32d78e68d2cf40d36827ebaa03212cffd5abce3b998be7365ac55839f65a94f

66 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File: Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings related to PDF JavaScript and JS streams. The JavaScript stream, identified as 'javascript_obj0005_000.js', likely contains obfuscated code designed to download and execute a secondary payload. The use of unescape() and String.fromCharCode further suggests an attempt to hide malicious functionality.

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` `02c338997dd79bafdb59bac8614040e72edd0e1588f45ceeb5d12be1f5e6d85e`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	550 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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