PDF malware analysis — malicious · 5741c4bba645ba16

MALICIOUS

PDF

118.6 KB

MD5: 37c049d3fd7e6c14b5201db645cd0a07 SHA-1: 32af7365446259ecf9c24b16d2755621e0b3f9bb SHA-256: 5741c4bba645ba169d7750d54e63da9edb83bad93ec4c1a657ac018d48d11dec

166 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical ClamAV detection and high-severity heuristics for JavaScript eval() calls and large comment-padded eval stagers indicate a malicious PDF. The embedded JavaScript stream, identified as 'javascript_obj0006_000.js', is highly suspicious and likely responsible for executing the exploit. The PDF structure and embedded JavaScript strongly suggest an attempt to leverage a known PDF vulnerability to download and execute a secondary payload.

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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0006_000.js` `11b70b4e32324da175a7d2df8ac3331903508f1c7599c4ac9a43370ffa649e4e`	pdf-javascript-stream	PDF /JS object 6 at offset 0x143	626546 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).

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