PDF malware analysis — malicious · 1d8c14fd3872e542

MALICIOUS

PDF

933 B

MD5: 4db4574bea8d0683b6f0c6c6bac0e46a SHA-1: 08842574897964a46857b3a6e0fe76c4986f998a SHA-256: 1d8c14fd3872e54293b88ed01077cbc3ddb81d4cd8a5a2fd08ce5a1f72883ddf

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by multiple heuristics including PDF_JAVASCRIPT and PDF_JS. The JavaScript stream, found starting at offset 0x18D, utilizes `unescape()` and `String.fromCharCode()`, suggesting obfuscation. This script is likely designed to download and execute a second-stage payload. The presence of obfuscated JavaScript within a PDF is a common delivery method for malware.

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` `71978391e8fb409fcc48bf19de3d75d5cf237875fb86283da5a6872b87483965`	pdf-javascript-stream	PDF /JS object 5 at offset 0x156	755 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 7 eval/decoder/string-building token(s).

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