PDF malware analysis — malicious · 0072da46742e2e18

MALICIOUS

PDF

5.2 KB Created: ÁØz;µ¯£Y:ûÉ®Ú Authoring application: #Vvö¹£Z-ùÞÙ (via #Vvö¹Âö/#þ3ãe§¡~ùÐ3«-)

MD5: 75fc3e87a7b5c61eee442eefc64275db SHA-1: c34cbecf81af6dcb77a2955c6f1e3e8f36ff1c71 SHA-256: 0072da46742e2e18c40ac2b48bd0618250b3dcd4e68b8f33438b90b0861ff0f0

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, flagged by multiple heuristics, which is designed to download a secondary payload. The JavaScript explicitly contains the URL 'http://195.88.3' for this download. The ML classifier strongly indicates maliciousness, and the PDF is encrypted with JavaScript, hiding its full contents from static analysis.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 5

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

PDF declares /Encrypt and also references an executable trigger (/OpenAction). 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.
PDF JavaScript shellcode contains an embedded download URL high PDF_JS_SHELLCODE_DOWNLOAD_URL

Decoded PDF JavaScript shellcode contains a hardcoded http(s) URL stored as little-endian %uXXXX Unicode escapes. Reader exploit shellcode embeds the second-stage fetch URL this way and pulls it down with a urlmon/URLDownloadToFile-style download-and-execute (commodity downloader behaviour rather than a specific Acrobat CVE).
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 URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://195.88.3

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0024_001.js` `3f24fb08727132ba15aa17b0f8939b8ab5c513f1440168da1c22bfe165f394fd`	pdf-javascript-stream	PDF /JS object 24 at offset 0x8D1	4380 bytes

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