PDF malware analysis — malicious · 1a92f4c9f6395fde

MALICIOUS

PDF

3.3 KB Created: 2008-31-20 53:85:00 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: f353a1819e3412fbd06e78bb37a331ca SHA-1: cde6d02565280fd4f2c02da190e1a7f9bb0aa733 SHA-256: 1a92f4c9f6395fde957b7795818ed94b0ee22808a0f4058b359668dac162ff42

96 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EVAL and PDF_FROMCHARCODE firings suggest that the JavaScript is obfuscated and uses eval() and String.fromCharCode() to execute arbitrary code. The ML classifier strongly flags this PDF as malicious. The deobfuscated JavaScript likely downloads and executes a second-stage payload, although the exact URL or execution method could not be determined from the provided evidence. The presence of obfuscated JavaScript points to a downloader or dropper functionality.

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` `83aa45980893b4b928e83b06f0e2f4705c4ab7118f162a49bdc29654e995bcdd`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3D7	5845 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).
`deobfuscated.js` `c53e650a8b47d7fdb7c60f2e5effdb8ee0933553fed36110fcc1c9b607b7b2a6`	deobfuscated-js	PDF JavaScript deobfuscation pass	13639 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s). Carved artifact contains 2 long base64-like blob(s).

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