PDF malware analysis — malicious · cfa667ee989dcac4

MALICIOUS

PDF

35.6 KB Created: ÄrõÖb3!\001Ú5?003Ä¸ì006ç* Authoring application: Á+µ0jd(ÛYØt.016Á¸ (via Á,¨7+QÔ037ÐRÍ&6030Þ¦î)

MD5: de46591e687b480d1c02fee1fc04bb28 SHA-1: 1d655ec2aaddc2bc6b4f60e4d5d294847077a4d8 SHA-256: cfa667ee989dcac425aaef1bf6c8f22820be1a845c2283f48c506d2bccd9725f

86 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file was flagged as malicious by an ML classifier with high confidence. It contains embedded JavaScript, and the PDF itself is encrypted with JavaScript, indicating an attempt to conceal malicious activity. The presence of JavaScript actions and streams suggests the document is designed to execute code, likely to download and execute a second-stage payload.

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` `aaf67ba9d3cfd8275edd78641d351b3b507dded4417f59924f6e8080c9a5c065`	pdf-javascript-stream	PDF /JS object 21 at offset 0x17B6	133 bytes

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