PDF malware analysis — malicious · 880de59236290f4a

MALICIOUS

PDF

MD5: 8bef8fcd4bb06ce8e1d0424d4d6d32f7 SHA-1: d02e6b3c7a9db6e8da76d744f4ad81a08be26b05 SHA-256: 880de59236290f4aee28dd57967b1585e833d0112f6b5d15ef214ea247011803

234 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript that uses the exportDataObject and nLaunch functions to automatically open an embedded file named '20170405154600.docm'. This is a common technique for dropper malware. ClamAV detections further confirm its malicious nature as a downloader.

Machine Learning

Nyx PDF Classifier malicious score 0.9997

Heuristics 6

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. (matched in decompressed stream)
ClamAV: Pdf.Dropper.Agent-6299418-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-6299418-0
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`20170405154600.docm` `c63312b5de8dc74d29a06e4ebb193c09e1e7b902de0a91a3a7a97265ec50280a`	pdf-embedded-file	PDF EmbeddedFile object 3 at offset 0x61	78433 bytes
Detection ClamAV: Doc.Downloader.Donoff-10030369-0 Obfuscation or payload: unlikely
`javascript_obj0005_000.js` `aefc4191e56109e487afd80da762c8012d7e477f950a29be6c76daf93610d5bd`	pdf-javascript-stream	PDF /JS object 5 at offset 0x1178C	103 bytes

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