PDF malware analysis — malicious · b515c4caeddf07df

MALICIOUS

PDF

4.3 KB

MD5: 35e507f5528bc1e5623211fcc75a40cd SHA-1: b581304a98584c4aab0da394d0e81db1f96717ff SHA-256: b515c4caeddf07dfeafdfdacee3706faf3f778bbdbb765fbf6173b3618041782

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript

The PDF file 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() for execution. This obfuscated script, found in javascript_obj74601_000.js, is likely responsible for downloading and executing a second-stage payload. The extracted document body content is not human-readable and does not provide further clues.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj74601_000.js` `01bc2e62c70b47dab10edf7e27b8035ce0dcb8a3d39006ae23335f651c86d5ec`	pdf-javascript-stream	PDF /JS object 74601 at offset 0x139	8302 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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