PDF malware analysis — malicious · 6504e90f463974d9

MALICIOUS

PDF

52.4 KB Created: 2025-09-28 19:23:03 UTC Authoring application: DocFly First seen: 2026-04-23

MD5: 3207bd640e7c4fc886b8cfa16c7b64fb SHA-1: b7ed6cc6a658a641ee6f9222a40c5412dea2a459 SHA-256: 6504e90f463974d97e7ebf401d4c1a557ed6c06bae143718d6f74b5f9ae50952

478 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1059.001 PowerShell T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF document contains embedded JavaScript that leverages the Shell.Application COM object to execute mshta.exe. Mshta then runs a PowerShell command that downloads and executes a second-stage payload from the URL 'https://potalgonabunbunsed.blogspot.com/compac.pdf'. The document also contains a lure URL 'https://account.bo0king.co/#invoice-1637482117.pdf' which is likely part of the phishing pretext.

Machine Learning

Nyx PDF Classifier malicious score 0.9998

Heuristics 14

/Launch action target: mshta critical PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target — references a known-dangerous executable (cmd, PowerShell, etc.).
/Launch action targets mshta.exe (LOLBIN) critical PDF_LAUNCH_MSHTA

PDF contains a /Launch action whose /F parameter names mshta — Microsoft's legacy HTML Application host, used as a LOLBIN to run inline JScript/VBScript from a /P parameter (typically a `javascript:` URL). MITRE ATT&CK T1218.005.
/Launch /P parameter is a javascript: URL critical PDF_LAUNCH_JS_PROTOCOL

PDF /Launch action passes a `javascript:` URL as the /P parameter — mshta interprets this as JScript when used as the launched handler, giving inline script execution without a separate payload file. MITRE ATT&CK T1218.005 + T1059.005.
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).
Shell.Application.ShellExecute COM pivot critical PDF_SHELL_APPLICATION_PIVOT

PDF contains a Shell.Application object instantiation followed by a ShellExecute call — an evasion technique that can spawn the next-stage process via COM rather than the PDF /Launch action, sidestepping the reader's /Launch confirmation prompt. Often paired with mshta and a `javascript:` URL.
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
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 52 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.
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.
Additional-actions dictionary low PDF_AA

PDF defines /AA (Additional Actions) that references an executable action (JS/JavaScript/Launch/SubmitForm) — can auto-trigger on document or widget events. Form-field calc/format/validate/keystroke handlers in legitimate interactive forms commonly fire this, so it is reported as a low-weight signal; weaponised auto-execution is flagged by stronger rules (PDF_OPENACTION, encrypted-with-JS, etc.)
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://account.bo0king.co/#invoice-1637482117.pdf
- https://www.dynaforms.com
- https://potalgonabunbunsed.blogspot.com/compac.pdf
- http://www.w3.org/1999/02/22-rdf-syntax-ns#
- http://ns.adobe.com/pdf/1.3/
- http://ns.adobe.com/xap/1.0/
- http://ns.adobe.com/xap/1.0/mm/

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `578fc8de6e928a575e0bbea33f45500a773ce9654d4069132b7d7e759cc50c6b`	pdf-javascript-stream	PDF /JS object 5 at offset 0xB8	70 bytes
`embedded_pdf_script_0000ca11.bin` `482a92344f5789757d52c48670feedd75ce49536b37d822dcc4f05e843ce4e22`	pdf-embedded-script	PDF decompressed stream script payload at offset 0xCA11	365 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 shell/COM execution token(s).

Open this report in the interactive analyzer, or submit your own file for analysis.