PDF malware analysis — malicious · 74f3b8fa787438db

MALICIOUS

PDF

5.1 KB

MD5: baa4eddc815d0f9e32638578ff3131be SHA-1: 351f26b4dcd1b8a566621c8c5a55ef0dd3983bae SHA-256: 74f3b8fa787438db4cfd77c7c0ee42120e1cedaa1902ed5331dd9aef342ebd4d

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

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, named 'javascript_obj6789_000.js', is likely responsible for downloading and executing a secondary payload. Due to the obfuscation, the exact nature of the payload and its destination could not be determined with high confidence.

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_obj6789_000.js` `90bb11dc857a8b7bb1a52e2e599e01a19fc94e99545ad7ddbf87beba8baa9f6f`	pdf-javascript-stream	PDF /JS object 6789 at offset 0x138	8380 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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