PDF malware analysis — malicious · fd1b1fe96b57b1ea

MALICIOUS

PDF

118.6 KB

MD5: bca3c85becb67d0156940f8fca87e616 SHA-1: 03b80d4a4393db439c5c5fc8890e1af845540a51 SHA-256: fd1b1fe96b57b1ea1c60d689d82159424659626b9612959a117a84b4f38a3e0e

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.002 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, as indicated by multiple PDF_JAVASCRIPT and PDF_JS heuristics. The presence of a high-severity PDF_EVAL and PDF_JS_LARGE_COMMENT_PADDED_EVAL firing suggests the JavaScript is obfuscated and designed to execute arbitrary code. ClamAV detection of 'Pdf.Exploit.Agent-36086' further confirms its malicious nature. The primary attack pattern involves leveraging a PDF exploit to run this script, which likely acts as a downloader for further malicious activity.

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` `af87c6fd096434678deddc7a5df156d837fead410a37facbcc51ff5cad228e32`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	627484 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_off0001d6d6.bin` `95514b47c14cc7907f7028454f9dd58622ded4eb72d007b74ede433ac34b8fc3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1D6D6	300 bytes

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