PDF malware analysis — malicious · 808db7c067fec0e2

MALICIOUS

PDF

118.5 KB

MD5: a1e946e693976e2b043e7f5874c6d96d SHA-1: a1eb82f5ad20f3156363739c186e9b462ac736bf SHA-256: 808db7c067fec0e259ee078cc89215c67d821d4433578bf10336f3e90f387827

174 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF document contains embedded JavaScript, identified by multiple heuristics including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_OPTIONAL_CONTENT'. A critical heuristic, 'PDF_JS_LARGE_COMMENT_PADDED_EVAL', indicates a stager designed to execute obfuscated JavaScript, likely for downloading and running a secondary payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The presence of 'eval()' and 'String.fromCharCode()' within the JavaScript stream suggests dynamic code execution and obfuscation techniques commonly used to evade detection.

Heuristics 8

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)
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `02a0c362dc2c0b5800a882af671f6c9e140027028c3120c8c7767f3ca47825bc`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626952 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).

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