PDF malware analysis — malicious · d1b6808e43617e68

MALICIOUS

PDF

50.7 KB

MD5: b0c3ebc717d0adb164ecff17218d5573 SHA-1: 2fde8bc6dd8e5c5a0a1b84050ef5df57faa34504 SHA-256: d1b6808e43617e6891feb4a2b77e9ad32f9673762829f68e7a1975d48ff8f7c4

258 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell T1071.001 Web Protocols T1200 Hardware Add-in

The PDF file contains embedded JavaScript and a PowerShell download cradle, indicating it's designed to download and execute a second-stage payload. The presence of a UNC path suggests an attempt at credential theft via NTLM relay, and the overall structure points to a phishing lure designed to trick the user into clicking a link that leads to a payload. The embedded script is a PowerShell download cradle: powershell -ep Bypass.

Heuristics 9

UNC path in PDF — possible NTLM credential theft (CVE-2018-4993/CVE-2019-7089) high CVE likely CVE_2018_4993

PDF contains a UNC path (\\server\share) alongside action triggers — when a vulnerable viewer resolves this path, Windows may send NTLM credentials to the remote host as the matching PDF action is processed
PowerShell download cradle in PDF action body critical PDF_PS_DOWNLOAD_CRADLE

PDF contains a PowerShell download-and-execute cradle (IEX/Invoke-Expression of a remote payload, [Net.WebClient]/[Net.ServicePointManager], or `-ep Bypass -enc <base64>`). These strings are rare in benign PDFs and are strong evidence of payload staging in an attack chain (MITRE T1059.001 + T1105).
PDF link points directly to executable/archive payload critical PDF_DIRECT_PAYLOAD_LINK

PDF contains a clickable HTTP(S) URI whose path ends in an executable, script, shortcut, disk image, or archive extension. Documents can legitimately link to installers, so this is a high-risk delivery indicator rather than a standalone exploit fingerprint.
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.
Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE

PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 50 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
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.
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. (matched inside decoded stream)
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. (matched inside decoded stream)
External URI info PDF_URI

PDF contains an external URL action

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off0000c470.js` `3de0fc2b3525bd423b6557ba24cabebc65d3b3470dbf9b96e4760e48178c7b4f`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xC470	2671 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).

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