PDF malware analysis — malicious · 276cf8911b71a645

MALICIOUS

PDF

118.6 KB

MD5: 765c6a997cf6a9914866d7ec9dcf41d5 SHA-1: f86ab57efbce1cb36f2daa6ec2bc6e80c67ee64f SHA-256: 276cf8911b71a64599f3e1ba3cb799d3deed409f160da6d2034869684ea4f4d1

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample is a PDF file that contains embedded JavaScript, as indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristic firings. The presence of PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL rules, along with ClamAV detecting it as 'Pdf.Exploit.Agent-36086', strongly suggests it's designed to exploit a vulnerability. The JavaScript is likely used to download and execute a secondary 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` `7ab5250f4e6cff6510203ff946facc08cb090db2838e8b574e64baaa25a042ec`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627737 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_off0001d713.bin` `f970242ee64466f88944bad0226dc793e6d92a8b30e1fa9af160d0fdff264737`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D713	300 bytes
`legacy_pdfkit_stage_000.js` `649144d963b27652d7db57e1d6acdf16453bd5141caa49a719c32b85ee6cdbe9`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 686 long base64-like blob(s).

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