PDF malware analysis — malicious · e659e53c335ef7fa

MALICIOUS

PDF

15.8 KB

MD5: 63890db0b18791bfa9b1302f969b96d6 SHA-1: cebb70126544b27e35b4ed580d69eb5b6aff05eb SHA-256: e659e53c335ef7fa476a8158a921b034484ce5e1fd0fb557e1deec4d40534aa3

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, which is a common technique for obfuscating malicious code. The presence of `eval()` and `String.fromCharCode` calls strongly suggests the script is designed to dynamically construct and execute code. ClamAV detection as 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The script's likely intent is to download and execute a second-stage payload, although the specific URL or execution method is not directly discernible from the provided evidence.

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` `029c7d0ba1687b0b0526feddc3ceb315f2aa5f03aa83fe6ae4a06d12189e6b63`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	425598 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_off00003b9a.bin` `32b597f604573446259695cc14523b45fb623d18e83954b1a6ca9a2a0ab8f91d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B9A	300 bytes

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