PDF malware analysis — malicious · ec90d170d2e4fdfe

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: 1b5466f54e3cccbb61484074f600e0ec SHA-1: f8adb317ef24f65de664de5dac3113a5a5c6c85b SHA-256: ec90d170d2e4fdfee432381a578f3893f2c1e87867423e5a05afaa214c9b36c2

438 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file exhibits malicious characteristics, including embedded JavaScript and a critical finding of an embedded PE executable payload. The presence of JavaScript actions and streams, combined with the embedded executable, strongly suggests the document is designed to download and execute a second-stage payload. The PDF also uses parser-evasion techniques, further indicating malicious intent. The ClamAV detection of 'Heuristics.PDF.ObfuscatedNameObject' reinforces the malicious classification.

Machine Learning

Nyx PDF Classifier malicious score 0.9868

Heuristics 13

ClamAV: Heuristics.PDF.ObfuscatedNameObject critical CLAMAV_DETECTION

ClamAV detected this file as malware: Heuristics.PDF.ObfuscatedNameObject
Hex-obfuscated scripting name object critical PDF_OBFUSCATED_NAME_OBJECT

A PDF name object that drives script execution (/JavaScript or /JS) is written with #XX hex escapes to hide it from string-based scanners — e.g. /J#61v#61S#63r#69p#74 decoding to /JavaScript. Legitimate PDF producers always write these names literally; hex-encoding an executable name is a deliberate evasion used by exploit-kit and dropper PDFs.
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 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 0x1159	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 0xD7FD	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 13

Related samples 6

Extracted artifacts 2