PDF malware analysis — malicious · d8a58b60404166d8

MALICIOUS

PDF

134.9 KB Authoring application: Ä°RmZ¤^N¯JàçªrÚ>Å¦Ýb2Íæ

MD5: 41ff9f7be922ccbf034266878954196f SHA-1: 35fd49b49ee081272a3ea4fb54da544e050e712f SHA-256: d8a58b60404166d84929db757b769f05e8b37af61a7560fcf011759fafb993f8

194 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

This PDF was flagged as malicious by ClamAV and a machine learning classifier. It contains embedded JavaScript and a launch action, indicating it is designed to execute a payload. The presence of PDF_ENCRYPTED_WITH_JS and PDF_LAUNCH heuristics suggests the document is obfuscated to hide its malicious intent, likely to download and execute a second-stage payload. The specific ClamAV detection name 'Win.Trojan.Dropper-135' strongly suggests its function.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 6

ClamAV: Win.Trojan.Dropper-135 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Dropper-135
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
Encrypted PDF carries /OpenAction — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/OpenAction). 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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0013_000.js` `666ed77ba6befad7acaaa158d3416f86f3d8740273d7bdcc5407f6fdfe89294e`	pdf-javascript-stream	PDF /JS object 13 at offset 0x2154C	82 bytes

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