PDF malware analysis — malicious · e624ac0a2cded4ca

MALICIOUS

PDF

31.3 KB

MD5: 21eee54cbf0b998be40ed0dbdecb5767 SHA-1: 656c088fb9be1448c79d9c95e668fafbde5fbee6 SHA-256: e624ac0a2cded4cad5ed0de8e360b9441ed31aea077cb664c5770bd063830f85

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript/JScript T1204.002 Malicious File T1559.002 Component Object Model

The PDF file contains embedded JavaScript and a RichMedia (Flash) object, indicating an attempt to exploit vulnerabilities. The JavaScript stream, specifically the `eval()` call and string concatenation, suggests dynamic code execution. The embedded `TyPWoIJRMY.swf` file is likely the second-stage payload. The combination of these elements points to a multi-stage attack leveraging PDF exploits.

Heuristics 6

RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0016.bin` `767382813fc770c9716554c3266b22eee1636037ca964af05acf6ff66db4a27d`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x11FC	26993 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.98, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `12a35660ee5df1a853aedc2f1f7b90ac12bf6531470b3f5cd4eded1128952aa6`	pdf-javascript-stream	PDF /JS object 6 at offset 0xF9	3507 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `609a19d934b4ce696123091b338b9e7cb2c8ab79b52543cd90c643422c36dba0`	deobfuscated-js	split-join delimiter stripped JavaScript at offset 0xDB1	2167 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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