PDF malware analysis — malicious · 4fc23f6841a9da1d

MALICIOUS

PDF

83.7 KB

MD5: 948f709c371a7b8fa43786af98e52ba1 SHA-1: d007797d20e92b5245f9697e49c6bdada3213ceb SHA-256: 4fc23f6841a9da1d027f2463d27f667256aca04fab22f42e038202956c7037fa

112 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

This PDF document contains embedded JavaScript and an embedded PDF file named 'msf.pdf'. The document body explicitly instructs the user to click inside a rectangle to save and launch the embedded 'msf.pdf' file. The embedded PDF itself has suspicious static findings, including JavaScript actions and the use of ASCIIHexDecode filters, indicating a likely attempt to deliver a secondary malicious payload. The primary attack pattern is social engineering to trick the user into executing the embedded malicious file.

Heuristics 6

Embedded PDF child has suspicious static findings critical PDF_EMBEDDED_CHILD_STATIC_TRIAGE

PDF contains an embedded PDF stream whose extracted child matches suspicious or malicious PDF heuristics. Wrapper PDFs are commonly used to hide the actual exploit or lure payload from scanners that do not recursively inspect attachments.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00000363.bin` `711eba38794a25845d61edc2d3e5e7add2ee1a59843ae1ba516ac3083da28b3a`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x363	65932 bytes
`msf.pdf` `7f40bed3ad3d74fd87d9a97b6d9cd99710bd5288176035a3cd5d586c06b64707`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x410	42074 bytes
`javascript_obj0009_000.js` `d34469e19a1a64397bfd3c97f146a8aca8c2e06509fc8ac323640cceb1b714e3`	pdf-javascript-stream	PDF /JS object 9 at offset 0x14CDC	56 bytes
`javascript_obj0009_001.js` `2bb1e7a202c327335e98a6e43785bbd246ca7796ccc763fad48de6300cba11eb`	pdf-javascript-stream	PDF /JS object 9 at offset 0x14CDC	54 bytes

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