PDF malware analysis — malicious · 2094a35216a75f17

MALICIOUS

PDF

244.5 KB

MD5: 97981230224ece900a362be9bcad7702 SHA-1: 811a8abc3a00f65682f989fa9bd33087d09bde55 SHA-256: 2094a35216a75f17f72f83d130909614cbefc068fecb422c4b00931c0d2f0d06

390 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1059.003 Windows Command Shell

This PDF file contains a critical PDF_LAUNCH heuristic firing, indicating it attempts to execute an external program. Further analysis reveals this launch action targets cmd.exe, which is used to execute a script that decodes a decimal byte array into a PE payload. This payload is identified as a Trojan Dropper by ClamAV, suggesting it's designed to download and execute further malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 7

Launch action critical PDF_LAUNCH

PDF contains a /Launch action whose target is an executable, URL, or UNC path — can start an external application
VBScript-style decimal byte array decodes to a PE payload critical PDF_VBS_DECIMAL_ARRAY_PE_PAYLOAD

PDF comment text contains a VB/VBScript-style decimal byte array, such as c(077),c(090), that decodes to a verified Windows PE executable. The rule is gated on a comment-line Array(c(...)) assignment and a valid MZ/PE header to keep false positives low.
/Launch action target: cmd.exe critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/c echo Set fso=CreateObject("Scripting.FileSystemObject"' — references a known-dangerous executable (cmd, PowerShell, etc.).
ClamAV: Win.Trojan.Dropper-133 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Dropper-133
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.
Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
Suspicious extracted artifact medium 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_pdf_script_0003cc5e.bin` `b6d0e19ae923e2fc841bc793fd6c669170c72a1aee4790503fb948a80512476b`	pdf-embedded-script	PDF raw stream script payload at offset 0x3CC5E	248931 bytes
Detection ClamAV: Win.Trojan.Dropper-133 Obfuscation or payload: likely Carved artifact contains 2 shell/COM execution token(s).
`decimal_array_pdf_pe_000001f5.exe` `64e2cf333614508445657d6ae013fde89b4c5281fc649de0def3d6d4b425848a`	embedded-pe	PDF raw comment decimal-array PE payload at offset 0x1F5	35328 bytes
Detection ClamAV: Win.Trojan.Agent-535339 Obfuscation or payload: likely Carved artifact entropy is 7.76, consistent with packed or encrypted content.

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