PDF malware analysis — malicious · 5070ed02d8a8d3d5

MALICIOUS

PDF

33.6 KB Created: ý¨Âóª^%¨oýÓ'ÈW!së o Authoring application: !8±¶±Á/í]¢çg (via !8¢¶±Ë/ì]®çpã)

MD5: 16d65c3f4ebcf950b8a42441df3d23e3 SHA-1: 36b72664486bdb6e16164e0d8bedbb854f51c05f SHA-256: 5070ed02d8a8d3d5dbde4d46c0c998a9c91a5f9682341dfd680229317e7c9c18

64 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file is encrypted and contains embedded JavaScript, a common technique to obscure malicious content. The heuristics indicate that the JavaScript is used to hide the payload, suggesting an attempt to bypass static analysis and deliver a malicious payload. The presence of JavaScript actions and streams points towards an exploit or phishing lure.

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.
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `31bff766867833dd349b1aa68f2b5f5debf10c9025a93fb6503cb05ed197cfd7`	pdf-javascript-stream	PDF /JS object 9 at offset 0x3C7	31764 bytes

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