PDF malware analysis — malicious · d2ca6f756bac2caf

MALICIOUS

PDF

118.7 KB

MD5: 17cfc4e733bd1bd28a0c17d37fbb5781 SHA-1: dab73d4a3f60fcdfbd1a09a8cb46febb429c0b79 SHA-256: d2ca6f756bac2caf9c8e046cfecb89a85d5f668a60d037d6471f688bbd66a6a7

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This indicates the file is designed to exploit a vulnerability and execute malicious code. The ClamAV detection 'Pdf.Exploit.Agent-36086' further supports this, suggesting it's a known exploit delivery mechanism. The primary function appears to be the execution of a secondary payload, likely downloaded from a remote source, though no specific URLs were extracted.

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` `62c991888d73e3f069a9793e722c89b457676f227dcb6ca56096bed9c6202de4`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627858 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_off0001d75a.bin` `21c53f3c7f334a53164b8be502cb1242ade70208c1e63a39dddbc851d7813c01`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D75A	300 bytes

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