PDF malware analysis — malicious · 2e916649e45305ca

MALICIOUS

PDF

244.1 KB

MD5: e9ab06f299699757261b80019e1097ee SHA-1: 6edcb00825f18c5f7d6c691a41abd428c1ba13d5 SHA-256: 2e916649e45305ca4f1502ec72e0179a228cbdc6ec3a2afdcb5609137b18f369

124 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, which is further obfuscated and encrypted, indicating an attempt to hide malicious activity. The presence of JavaScript actions and streams, along with an encrypted PDF carrying JavaScript, strongly suggests the document is designed to execute a payload. The primary attack pattern involves obfuscation and likely exploitation or phishing via the embedded script.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 6

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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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_obj0029_000.js` `4b9245b43ab6a4e729d8d338a7b694db8faa6b4e3679154f94fd2dc19b23b94f`	pdf-javascript-stream	PDF /JS object 29 at offset 0x1E2A	8601 bytes

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