PDF malware analysis — malicious · c8841df1239f1571

MALICIOUS

PDF

55.0 KB Created: 2010-07-06 21:04:53 Authoring application: Virtual PDF Printer - www.go2pdf.com (via Virtual PDF Printer1.01) First seen: 2026-05-10

MD5: 3b10ef0628957d2ee34ca8c85945d052 SHA-1: 3cc0d87ddd89c3a9f2e5cf58aef2be6a42b88420 SHA-256: c8841df1239f157137b5eac01b34ee0f2550f2a3508e0ba9ad89af09f613f8eb

478 Risk Score

Malware Insights

MITRE ATT&CK

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

This PDF file exploits CVE-2010-1240 via a launch action to execute a payload. The embedded JavaScript uses the `exportDataObject` function to drop and potentially launch an embedded executable named 'aaa.exe', which is disguised as 'nou1.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 14

Adobe Reader Launch action command execution critical CVE likely CVE_2010_1240

PDF uses the Adobe Reader/Acrobat Launch action pattern associated with CVE-2010-1240: a /Launch /Win command carries shell parameters that locate/start an embedded payload, and JavaScript passes nLaunch:0 for attachment export/opening.
ClamAV: Pdf.Tool.Agent-1388586 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Tool.Agent-1388586
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.
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.
Launch action high PDF_LAUNCH

PDF contains a /Launch action with an unresolved or extension-less target — treat as potentially dangerous
/Launch action target: "aaa.exe" high PDF_LAUNCH_COMMAND

PDF /Launch action specifies an executable target with parameters '/Q /C %HOMEDRIVE%&cd %HOMEPATH%&(if exist "Desktop\\nou1.pdf" (cd "Desktop"'.
/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.
Clickable PDF combines external action with parser-evasion structure high PDF_ACTION_PARSER_EVASION

PDF has an external clickable URI together with object graph or xref structures that make parsers disagree, such as divergent duplicate objects, parser divergence, or xref offset mismatch. That combination is stronger than a plain link: the document is both an outward-action carrier and a parser-confusion/evasion sample.
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 1 related finding 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
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 http://www.go2pdf.com PDF link annotation

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`nou1.pdf`	pdf-embedded-file	PDF EmbeddedFile object 16 at offset 0x1149	114688 bytes
SHA-256: `37121ecb7c1e112b735bd21b0dfe3e526352ecb98c434c5f40e6a2a582380cdd`
Detection ClamAV: No threats found Obfuscation or payload: likely actual_type=PE; declared_or_context_type=PDF; filename=nou1.pdf; kind=pdf-embedded-file
`javascript_obj0017_000.js`	pdf-javascript-stream	PDF /JS object 17 at offset 0xD7ED	53 bytes
SHA-256: `608eca199c721532742bef5fa07c8aa2add996038efe924ab3e67a7653ddc6b3`
Preview script First 1,000 lines of the extracted script this.exportDataObject({ cName: "nou1", nLaunch: 0 });

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PDF

Malware Insights

Machine Learning

Heuristics 14

Related samples 8

Extracted artifacts 2