PDF malware analysis — malicious · 1fc7c4249b2e0ed9

MALICIOUS

PDF

15.8 KB

MD5: c86c57914460685a29af7fdbd14249fc SHA-1: f84d7c0674a5804c1785e44e6fb3113f2696172e SHA-256: 1fc7c4249b2e0ed983b8965997ceb0cbbb0114eae0b7258f049d909ceb33d896

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a heavily obfuscated 'eval stager' that is designed to execute arbitrary code. The presence of 'eval()' and 'String.fromCharCode' heuristics, along with a critical ClamAV detection for 'Pdf.Exploit.Agent-36086', strongly indicates that this file is a malicious PDF exploiting a vulnerability to run a payload. The exact nature of the payload is not discernible from the provided evidence, but the pattern suggests a downloader or dropper.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `b4a22899c82b3b8cda892b39c7caa9de87b0a5a1f7e53f3d83455107fad29865`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425141 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).

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