PDF malware analysis — malicious · f4d5af89ff36d968

MALICIOUS

PDF

118.6 KB

MD5: 4f48eccb1000dbb83cb8f427a2006c86 SHA-1: d2d69554c9a6b29517dce2adff7870a9e6c6550d SHA-256: f4d5af89ff36d968f0d87770303767169628f911a16cf386c333fb58521ac17d

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which is heavily obfuscated and uses eval() and String.fromCharCode. Heuristics indicate a large comment-padded JavaScript eval stager, suggesting it's designed to download and execute a second-stage payload. ClamAV detection confirms this as a malicious PDF exploit. The document body is unreadable, so the rationale is based on the script behavior and exploit detection.

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` `46be4cfd88b4633699f4de4a24805f771bb997d5ab3953bcc79b5cfc514c6ca3`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627506 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_off0001d6ce.bin` `a25b8ab4a9420a5c59541b726a51b021d19c549c1dc19167439d27d7b8abd4ec`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6CE	300 bytes

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