PDF malware analysis — malicious · 85ba87c622305b17

MALICIOUS

PDF

5.1 KB

MD5: 87d9d5446f1eab39a0a9317506cf041c SHA-1: db4d2707d72aaf897a055642a749c8caa56218b8 SHA-256: 85ba87c622305b1739228d0ef1857e3ceabe2d448454a7492b170b8cb3ca64d4

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 likely attempts to download and execute a second-stage payload. The extracted artifact 'javascript_obj510932_000.js' further supports the presence of script content. Due to the obfuscation, the exact nature of the payload could not be determined, leading to a lower confidence score.

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_obj510932_000.js` `121bfde42919250a37a43d66cb56ed896656a916059cddfe623253ade5f7a1b7`	pdf-javascript-stream	PDF /JS object 510932 at offset 0x138	8382 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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