PDF malware analysis — malicious · 3dc1888d4f79695a

MALICIOUS

PDF

118.6 KB

MD5: 7347f17d460c19a15c1ce552bb518a46 SHA-1: f1eaf96a87a5fdfccaf9c363b35bbca4a1e3f2bc SHA-256: 3dc1888d4f79695a961b6889a7e390c0d77ac384ef1d1925095000876b16b88c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a high-severity heuristic firing for 'eval()' and a critical ClamAV detection for 'Pdf.Exploit.Agent-36086'. The JavaScript stream is heavily obfuscated and uses 'eval()' and 'String.fromCharCode', indicating an attempt to hide malicious code execution. This suggests the file is designed to exploit PDF vulnerabilities to download and execute a secondary payload.

Heuristics 7

ClamAV: Pdf.Exploit.Agent-36086 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-36086
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
Large comment-padded JavaScript eval stager high PDF_JS_LARGE_COMMENT_PADDED_EVAL

PDF JavaScript contains a very large stream padded with long random-looking block comments around String.fromCharCode and eval. This is an exploit-kit obfuscation shape used to bury a decoder and recovered stage inside noise, not normal PDF form automation.
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `d8dbb6189a1912574f49cdd18f752e1fd5198c8690d3eecefc2460b803d4f0ac`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626942 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 42 long base64-like blob(s).
`stream_001_off0001d6c8.bin` `63fd5ddbf089cfd64dc190a73347616db7274116be8916c2aa009296b1ddaac1`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6C8	300 bytes

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