PDF malware analysis — malicious · 7c1a99435da5e1ed

MALICIOUS

PDF

711.6 KB

MD5: 07db0d8094078d7323ffb5c6400ead37 SHA-1: 37e4cde75c4665f87ca5819ace562e54f1aaa1c4 SHA-256: 7c1a99435da5e1ed5a6dc667215e50b94a6b10673b57ae7f064d76e8542d46dd

294 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains JavaScript that leverages the exportDataObject and nLaunch functions to automatically extract and execute an embedded executable file named RFQ_4155965-Order_EU2406.exe. This is a common technique for delivering malware disguised as a document. The embedded file was detected by ClamAV as Win.Trojan.Autoit-10032689-0.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 7

Hidden ZIP payload with executable entries inside PDF stream critical PDF_HIDDEN_ZIP_EXECUTABLE_PAYLOAD

PDF stream bytes contain an embedded ZIP archive whose local headers name executable payload files. This is not a normal PDF attachment (/EmbeddedFile); it hides Windows payloads inside an ordinary stream, a strong malware-loader or smuggling pattern.
exportDataObject + nLaunch — embedded-file launch-on-open dropper critical PDF_JS_EXPORT_LAUNCH_DROPPER

PDF JavaScript calls exportDataObject() with nLaunch set, which extracts the document's embedded file and launches it in its default application. This is a launch-on-open dropper: the embedded file is the payload. No benign workflow auto-launches an extracted PDF attachment.
ClamAV: Win.Trojan.Autoit-10032689-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Win.Trojan.Autoit-10032689-0
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.
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 5

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`RFQ_4155965-Order_EU2406.uue` `697774af60f11d033be716cf4982a605d5c5ffa658f42df73235ee26514c949f`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x5DD	727320 bytes
Detection ClamAV: Win.Trojan.Autoit-10032689-0 Obfuscation or payload: unlikely
`javascript_obj0009_000.js` `d867af0ce76060dad66cab337b30df8b795dddd7c8f465dbe5ec2604c502cd71`	pdf-javascript-stream	PDF /JS object 9 at offset 0xB1C93	77 bytes
`javascript_obj0009_001.js` `379ba817f0ce5a75b7ac318dd63c7833a4c78a9373c744351a1a2b091e3e2a0f`	pdf-javascript-stream	PDF /JS object 9 at offset 0xB1C93	75 bytes
`hidden_pdf_zip_off000005e4.zip` `9cabf607ffc7c3682aec0aa7eb4a1d05485bb97014741cc45f7bcdfae4aad491`	pdf-hidden-zip	PDF raw stream ZIP payload at offset 0x5E4	726680 bytes
`combined_document_js_000.js` `55056b027a00fdeba777c5f7cda845566a39018b69bbfb4442d37ed5ddf66aaf`	deobfuscated-js	combined document JavaScript streams at offset 0xB1C93	153 bytes

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