PDF malware analysis — malicious · b26185f40a1edb8e

MALICIOUS

PDF

108.6 KB

MD5: bae997f186b7301dd04e1ec72c8ba086 SHA-1: daee3765966c828cd6feea4fca679d7675873191 SHA-256: b26185f40a1edb8e1d03c8fd7fa3e735073900d3f84841e51171a170be1802d9

194 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and an embedded file named 'testers.doc'. The document body instructs the user to open 'testers.doc' with Adobe Reader to view its content. This strongly suggests a social engineering lure to trick the user into opening the embedded malicious file, which is likely the primary payload delivery mechanism. The ClamAV detection on the embedded artifact further supports its malicious nature.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

ClamAV: Rtf.Dropper.Agent-7119036-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Rtf.Dropper.Agent-7119036-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`testers.doc` `4b519ff13603e0f241ffe5005f5a2e629700384ba67a29b1c888d6e58ebf3cea`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x3B9	54916 bytes
Detection ClamAV: Rtf.Dropper.Agent-7119036-0 Obfuscation or payload: unlikely
`javascript_obj0009_000.js` `9de8714b48604c97535529c03d7ef0049206139da3b7d5084e324c602a5c4c41`	pdf-javascript-stream	PDF /JS object 9 at offset 0x1B0D9	60 bytes
`javascript_obj0009_001.js` `aa6a0fe9dfed56166037361bc51d0bd4825f6984b538b6bad3ef16950f8eef9e`	pdf-javascript-stream	PDF /JS object 9 at offset 0x1B0D9	58 bytes

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