PDF malware analysis — malicious · e258039d6842a5f9

MALICIOUS

PDF

118.6 KB

MD5: 0af657891c7d758faeaf326402fbd97b SHA-1: f0b5e3413a9a20fd612b4db685941785850c550b SHA-256: e258039d6842a5f9ce27fd7cbc42047890aaeca3020abcd74694850a80c8484f

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_JS_LARGE_COMMENT_PADDED_EVAL'. The presence of 'eval()' and 'String.fromCharCode()' suggests obfuscated code execution. The critical 'CLAMAV_DETECTION' for 'Pdf.Exploit.Agent-36086' confirms malicious intent. The primary attack pattern involves leveraging JavaScript within the PDF to execute arbitrary code, likely for downloading and running further malicious content.

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` `035e98f244aaf9c706dfe6dbfa9ef40c2c65239cd5ead09d92197ff4ba213c58`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627005 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_002_off0001d879.bin` `74c4849c3f96aed20dd57bcb543c7edc203174b5efd4537e4c8af3ac44232f5b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D879	200 bytes

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