PDF malware analysis — malicious · 9342a1c7c9b630a7

MALICIOUS

PDF

235.9 KB

MD5: fd31781d955847c23d921a612bff0b56 SHA-1: 9de9891a348f644f131cd9c7d7d556ce13c655d6 SHA-256: 9342a1c7c9b630a7ac42cc56194acf5184e73394d75e8c63a91e0a62eb68d4d6

102 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF sample was flagged as malicious by an ML classifier and exhibits several high-severity heuristics indicating the presence of hidden JavaScript. The encryption combined with JavaScript suggests an attempt to conceal a malicious payload, likely for phishing or malware distribution. No specific IOCs were extracted due to the obfuscation and encryption.

Machine Learning

Nyx PDF Classifier malicious score 0.8132

Heuristics 5

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.
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0039_000.js` `7882fded4ffce89c01f54eb0d35dee569fa864a77e7ea7ebc8a3dff1bbbbc686`	pdf-javascript-stream	PDF /JS object 39 at offset 0x22B3	10106 bytes

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