PDF malware analysis — malicious · 4f5d1b5089e00fc9

MALICIOUS

PDF

3.4 KB Created: 2009-03-02 23:40:32 Authoring application: Scribus 1.3.3.12 (via Scribus PDF Library 1.3.3.12)

MD5: 62b464f253b1033b3d36630793e35c8c SHA-1: 18d342d4dbc3eb7f4d0a406118ef6445c3f75c39 SHA-256: 4f5d1b5089e00fc9824aede45ce5f87f92ff7d8920b50d158c1ad11d07d1ef83

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, and PDF_EVAL. The 'eval()' call and String.fromCharCode usage suggest obfuscation. The deobfuscated JavaScript likely performs malicious actions, such as downloading and executing a second-stage payload. The presence of obfuscated JavaScript and the PDF format points to a common delivery method for malware.

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_000.js` `81bdae15dce305a739ca2e81eb821097470318478ced420a2fbda175819537b6`	pdf-javascript-stream	PDF /JS object 13 at offset 0x3CE	7142 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` `408a4c74a8430b860d6020d96b5073cd0ba8ad1f00ef41d395c62eba9152eae2`	deobfuscated-js	PDF JavaScript deobfuscation pass	15807 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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