PDF malware analysis — malicious · f777a3b43490375e

MALICIOUS

PDF

45.2 KB

MD5: 3b4d4ac3c74f2cff2293a2b970e2a980 SHA-1: d41f82ac6a5c748e1042631286c2639630f9450d SHA-256: f777a3b43490375e3d33af0d8b8ea2682a1f6bd167e9780b3f98a91cfc60ada4

384 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The PDF file contains a launch action that executes cmd.exe with specific parameters, indicating an attempt to run a command-line process. This action is linked to an embedded Windows executable payload, identified by ClamAV as Win.Trojan.MSShellcode-7. The PDF itself is also flagged by ClamAV as Pdf.Tool.Agent-1388586. The combination of these factors strongly suggests a malicious intent to deliver and execute a secondary payload.

Heuristics 9

Adobe Reader Launch action command execution critical CVE exact CVE_2010_1240

PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: cmd.exe is invoked with attacker-controlled parameters, paired with an embedded/exported payload.
Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
Embedded Windows executable payload in PDF stream critical PDF_EMBEDDED_PE_PAYLOAD

PDF stream bytes contain an embedded Windows executable with a verified PE header. Exploit chains often hide droppers inside ordinary streams rather than standard /EmbeddedFile attachments.
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\template.pdf" (cd "Desktop"' — references a known-dangerous executable (cmd, PowerShell, etc.).
ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
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.
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0009_000.js` `bc1d5cdfa608238e3cd965aa51949d02f8ab713463ea0beb61ec928b121788d1`	pdf-javascript-stream	PDF /JS object 9 at offset 0xAFE9	57 bytes
`stream_001_off000003b5.bin` `cea492e12fe689e29411c6d4d74a4228477b1b9b93133a13d785f00b7471fc5a`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3B5	73802 bytes
Detection ClamAV: Win.Trojan.MSShellcode-7 Obfuscation or payload: unlikely

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