PDF malware analysis — malicious · e214baf4e44bc2dd

MALICIOUS

PDF

118.5 KB

MD5: 78c060ff457d7a1fb1a603d02a89379e SHA-1: 444f020094b27a4551ab7508a1086020d9a51261 SHA-256: e214baf4e44bc2ddea33fca90c9101bf74c113e05caed8013550d527c79470f2

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as a malicious PDF by ClamAV (Pdf.Exploit.Agent-36086). Static analysis revealed multiple JavaScript-related heuristics, including PDF_JAVASCRIPT, PDF_JS, PDF_EVAL, and a high-confidence PDF_JS_LARGE_COMMENT_PADDED_EVAL, indicating the use of obfuscated JavaScript for exploitation. The presence of these indicators strongly suggests the PDF is designed to exploit vulnerabilities via embedded scripts, likely leading to the download or execution of a secondary payload.

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` `d831cbde4798844a4dea1a1f2655d477ba803f7db9d36877ec0f17282e19e9c1`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626164 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` `ecbfe8158c3a73c7d75f8d448071c9ac601af520851ed6c506ce6ace596fd79d`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 568 long base64-like blob(s).

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