PDF malware analysis — malicious · 49c800eb79b0140e

MALICIOUS

PDF

118.5 KB

MD5: c26273fe5c2ebcd2f7a7fa19d1975baf SHA-1: ab189e6b1482e659b324bcfbd84439107e2d5632 SHA-256: 49c800eb79b0140e9166305384ad571e9b348996c3976c6e7e21d10a2a2a3eb8

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, with high-confidence heuristics indicating obfuscated code and an eval() call. This JavaScript is likely used as a stager to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The specific attack pattern involves exploiting PDF vulnerabilities to run arbitrary code.

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` `4a5fe948761d972c673fc7e1ad392cd5391f5969705e1becd117407bb0f67a67`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626565 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).
`legacy_pdfkit_stage_000.js` `357ceb294b74fe0398a881d46fa109bcf27fc4fc6787801d5692c86fcbaf24ec`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262136 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 708 long base64-like blob(s).

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