PDF malware analysis — malicious · 4425bb0ac20510d8

MALICIOUS

PDF

15.8 KB

MD5: 7f8ed8c3da3164f6c6dc6851d9bbf06c SHA-1: ca24d55b25fa98767b762264c47da39d1a2654f5 SHA-256: 4425bb0ac20510d82c12dabfcb873f1c0457c5ab65e92d89109c6f69792316e9

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, including a high-severity 'eval()' call and a 'Large comment-padded JavaScript eval stager'. ClamAV detected this as 'Pdf.Exploit.Agent-36086'. The presence of these JavaScript elements strongly suggests the file is designed to execute malicious code, likely downloading and running a second-stage payload, which aligns with common PDF exploit techniques.

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` `0b87e0cb8216ad8aea4dfa559ad9708f64568fdb4f0ea615ae40d10f00097b32`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	424922 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_off00003b8b.bin` `ecb6855f51eb7b467e75abdf502169eb65a03fa75e5fd00a10e49fb2d0105b61`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B8B	300 bytes

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