PDF malware analysis — malicious · f76d4ce6ed0a615a

MALICIOUS

PDF

118.6 KB

MD5: 070a6d1f2d058c258206c62c43851bc2 SHA-1: ebd21ef7cc9627834b1f58a6c11f21f44a976bb8 SHA-256: f76d4ce6ed0a615a82e85f6845fd832dd479342655038c09d8ee67857f5b5d9c

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, including a large comment-padded eval stager and calls to eval() and String.fromCharCode(). These heuristics, along with the ClamAV detection of 'Pdf.Exploit.Agent-36086', strongly indicate that the script is designed to deobfuscate and execute malicious code. This code likely acts as a downloader for 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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `6436862d3985b843a1fae74d94aade465816e65768d91415cc0fbec9d3dba354`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627470 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_off0001d6c3.bin` `d167f016e3c7243dbd1888365349950fe48eebe466c6dcb16d3fc40bc0823f19`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6C3	300 bytes

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