PDF malware analysis — malicious · d3543d5bcfcfbd1f

MALICIOUS

PDF

15.7 KB

MD5: 99af730ac59ff66a45729a8591dc7172 SHA-1: 615fadbdb7fa1cd92dce1d36b72cd1a5e1ad39a9 SHA-256: d3543d5bcfcfbd1fdcaedf5639f0e7149740463b783a3823aad1f352151d8e27

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file contains multiple JavaScript streams, including one with a large comment-padded eval stager. The ClamAV heuristic 'Pdf.Exploit.Agent-36086' strongly indicates malicious intent. The presence of eval() and String.fromCharCode() within the JavaScript suggests code obfuscation and execution, likely to download and run a secondary payload. No specific family could be identified.

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` `77ca88f7d29d4829707541c605b661224169faa215e22af9c5bee8eae8431b30`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424910 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` `2d8085e61ce9b83e98de6b8853c3fbf5fe2356670e40070d9d880a780693d3ca`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262090 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 643 long base64-like blob(s).

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