PDF malware analysis — malicious · 4f2974bd59bf58d6

MALICIOUS

PDF

118.6 KB

MD5: 235b5eaf9908228c7eadbf5df7cb3a9e SHA-1: 3305b8772f9f2b536f4c81a38a0a64a7fabdbc20 SHA-256: 4f2974bd59bf58d6d0f23d5f171af9ba406d97343047bab2b231005fc2288c57

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF file contains embedded JavaScript, including a large comment-padded eval stager. This indicates the file is designed to exploit vulnerabilities within PDF viewers to execute malicious code. The presence of 'eval()' and 'String.fromCharCode' functions, along with the ClamAV detection signature 'Pdf.Exploit.Agent-36086', strongly suggests that this PDF acts as a dropper or exploit loader. The primary intent appears to be downloading and executing a second-stage payload, although the specific payload and its ultimate destination could not be determined from the provided static analysis.

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` `287a659d69ece77cb8257e1157a7603e4f5cc493e6ce29a9d05b100837889c3c`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626654 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).
`legacy_pdfkit_stage_000.js` `c5eb495de554bf371dcb1b4d4fa51ad26a1c107a933fb8afec6b03b4b0fd01e5`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x143	262144 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 673 long base64-like blob(s).

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