PDF malware analysis — malicious · fb32d46ec1c1c276

MALICIOUS

PDF

118.5 KB

MD5: 7008766e80c23537fbb237e1cd9f19cb SHA-1: 5e99d25819878f2832b13c93763b05d0e8561b10 SHA-256: fb32d46ec1c1c276998ee79fecfe76f78a96624e38c3fe52b83fd593ec1acaaf

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1059.007 JavaScript

The PDF contains embedded JavaScript, including a heavily obfuscated 'eval' stager. This stager is designed to decode and execute arbitrary code, a common technique for downloading and running further malicious payloads. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The obfuscated nature of the script prevents a more detailed analysis of its specific actions.

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` `11b36e2b34f93b23dc6f8e09dd080e9f56a418a9fe3df021a882f43ee397f8c2`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626728 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` `a4af88954a128da5407cefc5df05a6076e0dc53f2e01005d849f315c53cbb112`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 621 long base64-like blob(s).

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