PDF malware analysis — malicious · 89bb4e6bbb952118

MALICIOUS

PDF

118.4 KB

MD5: c75ce94909ee21c6456bef70db32c8bd SHA-1: a66e7940be089b872d63f049a65c3f99d076fee8 SHA-256: 89bb4e6bbb952118a4dcf78b82055e7f18dc758cd5a256993e48287c08317691

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, with high-confidence heuristics indicating the use of eval() and a large comment-padded JavaScript eval stager. ClamAV detected this as 'Pdf.Exploit.Agent-36086', strongly suggesting it's a malicious PDF exploiting a vulnerability. The embedded JavaScript is likely responsible for downloading and executing a second-stage payload, a common technique for initial access.

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` `724d1a536082fbb85a66868d49ecb7bb8fa29ff8a7ef2c91d07104a681004c09`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626586 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_001_off0001d641.bin` `aa61917197c731271260e63b571f5675edd180a8e31ed498212e9841296dfe32`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D641	300 bytes
`legacy_pdfkit_stage_000.js` `7192c6891a00738fd4726c1649e74dce84bb5b0e587356214fe84701053c894f`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 557 long base64-like blob(s).

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