PDF malware analysis — malicious · 6612505822284d9b

MALICIOUS

PDF

50.4 KB Authoring application: cairo 1.8.0 (http://cairographics.org

MD5: 29f0558a280c5aabab4125f2ff8d17b9 SHA-1: 1ed5aca85118c2177c643822dd95d3a5bea3da03 SHA-256: 6612505822284d9b658d4152132e1e58cddd07f757ad474d0f236e0f3c11ed3d

518 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains JavaScript that triggers a launch action for cmd.exe, which in turn executes a command to potentially download and run a payload. The embedded file is identified as a Windows executable disguised as a PDF, and ClamAV detections confirm it is a dropper/downloader. The ML classifier also strongly indicates maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

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
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 %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\Canada_Post_Notice_441.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: Win.Trojan.Dropper-131 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Dropper-131
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.
/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.
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
Suspicious extracted artifact info 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.
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 http://cairographics.org
- http://cactus.es��s

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`Canada_Post_Notice_441.pdf` `f02707ef50a89c4aaaa3741d5dbe7765f7eff98f8a464dd1c77ba95c6b0a0405`	pdf-embedded-file	PDF EmbeddedFile object 18 at offset 0x2083	44032 bytes
Detection ClamAV: Win.Downloader.95034-1 Obfuscation or payload: likely Carved artifact entropy is 7.81, consistent with packed or encrypted content.
`javascript_obj0019_000.js` `fbe6a2f480df05b9c1cdb3c7e497ab2a00d88055a8cee17585b299bf90105823`	pdf-javascript-stream	PDF /JS object 19 at offset 0xC552	71 bytes

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