PDF malware analysis — malicious · ff5f1e368e4d86d1

MALICIOUS

PDF

15.8 KB

MD5: c022c22925cbd87769fbd6fc733ebda2 SHA-1: e39d883e41310604177349647ae3d5b98684117b SHA-256: ff5f1e368e4d86d1e33af8284ecea47c7c0d17e9b78c51d43352fa0f59e9861b

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This indicates an attempt to obfuscate and execute malicious code. The presence of `eval()` and `String.fromCharCode` further supports this. ClamAV detected this file as 'Pdf.Exploit.Agent-36086', suggesting it's a known exploit. The primary attack pattern involves leveraging JavaScript within the PDF to achieve code execution.

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` `f90d047a33c13a093529b1798d9605bcff216dbfcb1c2e471830ba04f978e8dd`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	426418 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_off00003b97.bin` `425dedf660c30daf36713754c8a6de6564304412498ec4545e3f2a5829b258c0`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B97	300 bytes

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