PDF malware analysis — malicious · 422ab6ff02981f38

MALICIOUS

PDF

118.6 KB

MD5: 162ffd01f6e7a7916f24c64410d70248 SHA-1: 3481ba453c34fead16d874d23378d9f53d0b178b SHA-256: 422ab6ff02981f3804b2f2a0b4c68ec3664f23453b07a1122bbc0c19f3d004a2

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, as indicated by multiple heuristic firings including 'PDF_JAVASCRIPT', 'PDF_JS', and 'PDF_EVAL'. The 'PDF_JS_LARGE_COMMENT_PADDED_EVAL' heuristic specifically points to a stager designed to execute code. The ClamAV detection 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The presence of obfuscated JavaScript streams suggests an attempt to download and execute 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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `f66524e4545c96e69cd83e4da91151690a206549981f72372ec256e250ca1adb`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627963 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).
`stream_002_off0001d895.bin` `779b0ea0871afe2618ad086152779ef4c34bd43ae4e71deb03b5c33fd18b2726`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D895	200 bytes
`legacy_pdfkit_stage_000.js` `16482be0c4eee5385de61ba848e0546636ccd50338d18da3018fe6d621bae4d0`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 633 long base64-like blob(s).

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