PDF malware analysis — malicious · f27a2f3b430c0f70

MALICIOUS

PDF

353.6 KB Created: ÐîÏ<z-:ÞxuÑ÷íBÎ{ö³é Authoring application: Õ·c(t~È¦¸Òbè´î®Î<Î (via Õ·c(t~È(¶°ÕF{öûèÐëÙÅwó)

MD5: c92180fa4c8ddb0f28675653be1ee6c6 SHA-1: f56ee22caf7715af418eba150f5af9c0b5f6d402 SHA-256: f27a2f3b430c0f7035a18cc206d790b3d0df1bdeb36ed6aaab0a421c94c447c6

484 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 User Execution: Malicious File T1566.002 Phishing: Spearphishing Attachment T1059.003 Command and Scripting Interpreter: Windows Command Shell T1187 Exploitation for Client Execution

The PDF contains embedded JavaScript and a launch action that targets cmd.exe, indicating an attempt to execute a payload. Crucially, it embeds a Windows executable disguised as 'pdf-test.pdf', exploiting CVE-2010-1240 to achieve command execution and deliver the embedded PE payload. The ClamAV detection 'Pdf.Tool.Agent-1388586' further confirms its malicious nature.

Heuristics 12

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 (if exist "%HOMEPATH%\\My Documents\\pdf-test.pdf" (cd "%HOMEPATH%\\My Documents"' — references a known-dangerous executable (cmd, PowerShell, etc.).
Embedded attachment masquerades: declared document, content is windows-executable critical PDF_EMBEDDED_FILESPEC_CONTENT_MISMATCH

An /EmbeddedFile attachment's declared filename extension or /Subtype MIME type contradicts the magic bytes of its decompressed content. The attachment is declared as a benign document or image but the bytes are an executable or executable-bearing archive. This is a deliberate deception used to hide droppers in PDF attachments and is a generic indicator of embed-and-drop weaponisation, independent of any specific CVE.
ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
Encrypted PDF carries /JavaScript — payload hidden from static analysis high PDF_ENCRYPTED_WITH_JS

PDF declares /Encrypt and also references an executable trigger (/JavaScript). Document encryption hides the JavaScript body and stream contents from static scanners — combined with auto-execution indicators this is a known evasion pattern used to deliver weaponised JavaScript that the analyst cannot inspect without the decryption key.
/Launch action paired with attachment-dropping JS API high PDF_LAUNCH_PLUS_DROPPER_JS

PDF combines a /Launch action with a JavaScript API call that writes or opens an attached/external resource — the canonical shape of the CVE-2010-1240 /Launch + exportDataObject family. Benign PDFs do not pair these surfaces; the combination indicates a drop-and-execute chain regardless of the specific JS API knobs or /Launch target.
PDF paints image(s) but contains no text operators medium PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
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
`pdf-test.pdf` `20f7530727ff461de43af16a42d60f12cd5c79a808e8dbeb8ab98159bd325ece`	pdf-embedded-file	PDF EmbeddedFile object 74 at offset 0x51CA	776192 bytes
`javascript_obj0075_000.js` `fb51fefbefd777afb9f3dc5fe2931fe7e55d40f23f1e48c3f55c2594baa3964b`	pdf-javascript-stream	PDF /JS object 75 at offset 0x57F71	57 bytes

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