PDF malware analysis — malicious · 4dc7d5c114b3ec38

MALICIOUS

PDF

26.0 KB Created: 2011-72-51 03:25:00 Authoring application: String.fromCharCode

MD5: 5d19656e7bd54d0ce12a3c0b083f8cce SHA-1: 9bfddc170f589c7b73d2e5cdd3ffada3ffb5a7fb SHA-256: 4dc7d5c114b3ec385ebdb129adafd5b587b26de6ab13d41f4de12fe724ccf846

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 Command and Scripting Interpreter: PowerShell

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The JavaScript stream utilizes String.fromCharCode and an eval() call, suggesting obfuscation and dynamic code execution. The primary heuristic firing is PDF_EVAL, pointing to the execution of arbitrary code. The embedded JavaScript file, javascript_obj0001_000.js, is the most significant artifact. The script's purpose is likely to download and execute a second-stage payload, although the exact URL or execution method is not directly visible in the provided evidence.

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.
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_obj0001_000.js` `7693713aac44d9cdc162733b155b7c8d8e4a253e0358fcb7755e4a6f3ad8b8cf`	pdf-javascript-stream	PDF /JS object 1 at offset 0xA	853 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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