PDF malware analysis — malicious · 43a91f7a50c6a08c

MALICIOUS

PDF

150.8 KB

MD5: 4c7153942200df946d0da33a088d9c9f SHA-1: 1cf6d65e8d78f925dba9ccdfdf32f783b0c1a388 SHA-256: 43a91f7a50c6a08c7079536ffc4afec7c17fee9013c118f46c3a8755b501fa4d

194 Risk Score

Malware Insights

MITRE ATT&CK

T1559.002 Component Object Model Hijacking: DLL Side-Loading T1204.002 Malicious File Execution: Malicious File

The PDF file contains embedded JavaScript and a Flash object, indicated by multiple heuristic firings including PDF_JAVASCRIPT, PDF_JS, PDF_EMBEDDED, and PDF_RICHMEDIA. The embedded JavaScript stream and the extracted SWF file are suspicious artifacts. The ClamAV detection of 'Pdf.Exploit.Agent-35955' strongly suggests exploitation of a known PDF vulnerability. The embedded JavaScript likely facilitates the execution of the Flash object, which is a common technique for delivering second-stage malware.

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
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
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`AemNCzacqQvSuKs.swf` `c2b666a3ef4c191b77b78c037656e50477b8ba3d35fd61ae843a3a1f4d41c5c1`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x1CAD	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` `1193ba758f91290b61931a6a5616a5f5dca06fe76a3b0feaa2c8578b8fde3265`	pdf-javascript-stream	PDF /JS object 6 at offset 0x126	22003 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).

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