PDF malware analysis — malicious · 4b3c0180edbce162

MALICIOUS

PDF

118.6 KB

MD5: 18f537306a3218dea9033ea324f7039f SHA-1: 701b3dc205f572efa06bb846a1233acb8b304e70 SHA-256: 4b3c0180edbce162319c91cb32db962ece15f3569fab7f08b328c2faa6515b67

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. This indicates the script is designed to obfuscate and execute arbitrary code. The presence of `eval()` and `String.fromCharCode` further supports this. While the exact payload is not clear due to obfuscation, the ClamAV detection 'Pdf.Exploit.Agent-36086' and the heuristic firings strongly suggest this PDF is intended to exploit vulnerabilities or download a secondary malicious payload.

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` `ac83eedd4855f356f0223fa353267664fc9eb47ba1394c102bc4d47d84adfa66`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626103 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_off0001d885.bin` `7e4f30d1e99669251c707ae9fd844e5b383b5570346cf3d023a4aa390cbe4abf`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D885	200 bytes

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