PDF malware analysis — malicious · 2e4b3a67da3987d6

MALICIOUS

PDF

15.8 KB

MD5: 53ee7c3566ef8d9c7889540b987179df SHA-1: 37633f72c3b68a6723be10a6d5f2862035db848f SHA-256: 2e4b3a67da3987d668a63fd46e4585b22a2aeb4e953617064e602b609020be41

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript, which is heavily obfuscated and uses eval() and String.fromCharCode. Heuristics indicate a 'Large comment-padded JavaScript eval stager', suggesting the script is designed to deobfuscate and execute further malicious code. ClamAV detection confirms this as 'Pdf.Exploit.Agent-36086'. The primary attack pattern involves exploiting PDF vulnerabilities to achieve arbitrary code execution.

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` `979871beae5950756ec38fb12e759dc89581366684e51ff94942cdf5d427684b`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425721 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_off00003d33.bin` `e4e3256480cc3ffb611edcdcf96eb03814df291b18c62361177d5f7bccb2504b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3D33	200 bytes

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