PDF malware analysis — malicious · 1ec283cc96e0eadd

MALICIOUS

PDF

237.6 KB

MD5: dcf16d15b1b00a3e828421ddf3f500e9 SHA-1: c110c606537e140c5630461555bfcd4cd7b6b544 SHA-256: 1ec283cc96e0eaddda04e322d64d8cbae9ad9ff3cc24affd3ca3b0e7e315dbd3

122 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF was flagged as malicious by a machine learning classifier. It contains embedded JavaScript, which is often used to obscure malicious payloads or exploit PDF reader vulnerabilities. The presence of PDF_ENCRYPTED_WITH_JS and PDF_FILTER_HEX heuristics further indicates an attempt to hide malicious content and potentially exploit known weaknesses. The primary attack vector appears to be the execution of hidden JavaScript, likely to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.8989

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_obj0039_000.js` `48c63892f85d4bb68b846b404f1c5fef5308ad527406154ec3af0a107f633e41`	pdf-javascript-stream	PDF /JS object 39 at offset 0x252F	9602 bytes

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