PDF malware analysis — malicious · 5e941a057799349e

MALICIOUS

PDF

4.16 MB Created: KVÔ5(M( )sÍîÂªò¼5ñ[¾ Authoring application: <{S]8,±^xµÔÊyµ²=§1P (via N^g >|v1·÷ å%ø[ «bmÿbRãùñß)

MD5: 2dfb27c562b7e7edb0541471e3bccec4 SHA-1: 3e6533ffbfb144313269f42db695868a97c1b493 SHA-256: 5e941a057799349e02af9ec5a6f326c0527ab249df624faa369d7efdcbd390e4

522 Risk Score

Malware Insights

MITRE ATT&CK

T1204.002 Malicious File T1566.002 Spearphishing Attachment T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

This PDF file contains embedded JavaScript and a launch action that executes cmd.exe. The embedded file, declared as 'MMT.pdf', is actually a Windows executable. The PDF leverages CVE-2010-1240 to execute commands and drop the embedded malicious payload, which is detected as Win.Trojan.MSShellcode-7 by ClamAV. The ML classifier also flagged this as highly malicious.

Machine Learning

Nyx PDF Classifier malicious score 0.9801

Heuristics 13

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
/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\\MMT.pdf" (cd "Desktop"' — 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
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.
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.
Unusually high stream count medium PDF_MANY_STREAMS

PDF contains 501+ stream objects — may indicate heap spray or heavy obfuscation
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
Optional Content Group with action trigger low PDF_OPTIONAL_CONTENT

Optional Content Group (layer) co-occurs with an action trigger — content can be selectively hidden from viewers or scanners while the action still fires on open

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`MMT.pdf` `8e288d85f4cc37c6e3f65d8482e4c6e45097d00df03fc6a81541aac96ccd0a1d`	pdf-embedded-file	PDF EmbeddedFile object 15400 at offset 0x41D949	73802 bytes
Detection ClamAV: Win.Trojan.MSShellcode-7 Obfuscation or payload: unlikely
`javascript_obj15401_000.js` `d52337395ecfb77b88e66030c7838e60b833e4bd2c1d9336370e02cccf4ca722`	pdf-javascript-stream	PDF /JS object 15401 at offset 0x4285D9	52 bytes

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