PDF malware analysis — malicious · 8a963e88c34cea31

MALICIOUS

PDF

35.2 KB Created: .3¡x.`Ógß$Ü|ûî}004Z¨Ö} Authoring application: +mÏÑôh_29tlóðg032X

MD5: 1bcac0e452a117a4a9de74838fb371ba SHA-1: 5e8e28dab53edc8fcc77e0124d08100c73287338 SHA-256: 8a963e88c34cea3159e845e0fe9431ea36a380207686241a4d11cc59508c26ad

86 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1027 Obfuscated Files or Information

The PDF file was flagged as malicious by an ML classifier and contains embedded JavaScript. The JavaScript stream is likely used to obfuscate and deliver a malicious payload, as indicated by the 'PDF_ENCRYPTED_WITH_JS' heuristic. The presence of JavaScript actions within the PDF structure strongly suggests an attempt to execute code upon opening.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 3

Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
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.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0021_000.js` `a91fc889e0c3199476eae11c8be1653933414af9d4bbc9a61ca391b345ff95f0`	pdf-javascript-stream	PDF /JS object 21 at offset 0x179E	133 bytes

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