PDF malware analysis — malicious · f87c8a0d0386375c

MALICIOUS

PDF

5.1 KB Created: 2008-08-06 01:42:27 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: a5e1f34e5ef54396ece7f1a0e846d939 SHA-1: 454464bc566e0692241d4b3e7cc7e15011359bae SHA-256: f87c8a0d0386375c60f4eee5f6c872c4d47d39d67c0404b5f10f8c64fab38ad1

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

This PDF file was flagged as malicious by an ML classifier with a high confidence score. Static analysis revealed embedded JavaScript streams, including one that uses eval() and String.fromCharCode, indicating obfuscated code execution. The presence of 'acroform_b64_00.js' and 'javascript_obj0013_001.js' suggests the script is designed to download and execute a secondary payload, a common technique for malware delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `ac84b59983fd8ace98dd6c4ba4ab79b0ba9db7f04cbd9f6dc7cb002951df9427`	pdf-javascript-stream	PDF /JS object 13 at offset 0x365	6549 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` `13f7ae261282459449872cf54c0467deab0ba3b5d6924988792005dc9e0bca3c`	deobfuscated-js	PDF AcroForm base64 (decompressed) at offset 0x71D	4236 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.