PDF malware analysis — malicious · 30b751887354a068

MALICIOUS

PDF

162.9 KB Created: g¬$J @á7ìÃ;\^2£'í×ûïuQ5;în4(¾êâ¹?E¸}WãÀ$ Authoring application: môn(wï+ÌwfVM204÷-ÊUWÍYj=NÇaÉ`ïá<Ô`øuÃáÅ (via ?¨²MBBiND3PSµèÒý=ºÔðDe¼G(E;¯@díH:¿òÊ£2B>b×®FÇvÕ)

MD5: 94ac1b6bca12b5f0e37555643f883037 SHA-1: 2586ecc9a58136df0ffbb5edbadeac340bb4a567 SHA-256: 30b751887354a068ae5de26982491486baa54cee2a35f95c61d6942a4b27b91d

64 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file was identified as malicious due to several heuristic firings, including the presence of JavaScript actions and an encrypted structure that hides its payload. The PDF_ENCRYPTED_WITH_JS rule indicates that the encryption is specifically tied to JavaScript, suggesting an attempt to conceal malicious code. The embedded JavaScript stream further supports this. The exact nature of the payload is obscured, but the techniques used point towards an obfuscated malicious document designed to evade detection.

Heuristics 4

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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0061_000.js` `409681d9633fda4b4cab8fbb1ea2d8ca3fdb1da6dd234bc076f21675ac67c140`	pdf-javascript-stream	PDF /JS object 61 at offset 0x27ED6	608 bytes

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