PDF malware analysis — malicious · 42a167f23220828e

MALICIOUS

PDF

118.6 KB

MD5: ae6dfc55d1dfcc02319e1640e209f2da SHA-1: be9eedafcc5a3e934691d5a21eaee1f10ad7440c SHA-256: 42a167f23220828e51a4b8a991aba5d5a072038908bfbd1bae588b3169080de5

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including calls to eval() and String.fromCharCode, which are indicative of obfuscation and execution of malicious code. Heuristics indicate a large comment-padded JavaScript eval stager, suggesting a downloader or stager for a second-stage payload. ClamAV detection confirms its malicious nature as Pdf.Exploit.Agent-36086. The document body was unreadable, but the script behavior strongly suggests the PDF's purpose is to exploit vulnerabilities or trick the user into executing malicious 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` `580d51379190b040c794cebe9e1e4fe005ad3d67f3dc9ca72b04fb36314354c6`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626581 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` `06a039051cf77b7eec0224b4f6eb0841935fdd63aa1c1fd0c1445f12e9f31c29`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 592 long base64-like blob(s).

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