PDF malware analysis — malicious · cb41ec165772e655

MALICIOUS

PDF

343.2 KB

MD5: 1b1ae81721210e13c5b334f638988481 SHA-1: dd5d29b70963b0a32ec57f5c789950d4b370c017 SHA-256: cb41ec165772e6552c59d533b3240ebedae34b0ce7fb084fa44b5a91fd736124

206 Risk Score

Malware Insights

MITRE ATT&CK

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

The file is a PDF containing embedded JavaScript and RichMedia (Flash) content, triggering multiple high-severity heuristics including ClamAV detection for 'Pdf.Exploit.Agent-35955'. The embedded JavaScript stream, 'javascript_obj0006_000.js', is the primary mechanism for exploitation. It is highly probable that this script is designed to download and execute a secondary payload from a remote source, as indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The presence of an embedded file, 'embedded_file_obj0016.bin', further suggests a multi-stage attack.

Heuristics 8

ClamAV: Pdf.Exploit.Agent-35955 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-35955
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.
RichMedia (Flash) high PDF_RICHMEDIA

PDF contains /RichMedia (Adobe Flash) which is a historic exploit vector
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
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
`embedded_file_obj0016.bin` `c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x4E2B6	26774 bytes
Detection ClamAV: Pdf.Exploit.Agent-35955 Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`javascript_obj0006_000.js` `333042fc77621860f9b16228cd1bd11ec0f99d0fa6930f548cbf65181a57aac5`	pdf-javascript-stream	PDF /JS object 6 at offset 0x13E	6441 bytes

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