PDF malware analysis — malicious · ae74de41a38c920a

MALICIOUS

PDF

MD5: 29e101877070587ca4408d041d7bf72a SHA-1: cd8cf046c944b385f71762da612b8b839e1c7ace SHA-256: ae74de41a38c920a67861ac6d68ff73b4d459dcd1197f14a4f8e385495ce849e

256 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains embedded JavaScript and an embedded file named '04092018.pub', which was detected by ClamAV as 'Doc.Downloader.Olemal-6668035-0'. The embedded JavaScript likely facilitates the execution of the embedded file, acting as a downloader for a second-stage payload. The document body contains a standard confidentiality notice, but the embedded content is the primary indicator of malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Doc.Downloader.Olemal-6668035-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Olemal-6668035-0
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.
Embedded script payload in PDF stream high PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain script execution markers such as ActiveXObject/CreateObject, WScript.Shell, PowerShell, or shell-exec primitives. This is stronger than ordinary PDF JavaScript because it indicates a staged external script payload hidden in stream bytes.
Suspicious extracted artifact high 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 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
`04092018.pub` `d65fedbeb78eb54ab688bc2ff9522008f584e8169043eaad51aa33c7bc09b8ff`	pdf-embedded-file	PDF EmbeddedFile object 1 at offset 0x8B	48128 bytes
Detection ClamAV: Doc.Downloader.Olemal-6668035-0 Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`javascript_obj0003_001.js` `11555310b5b417a7a837ff8f276451781f83bab4e799d7f00ea402c16ce34771`	pdf-javascript-stream	PDF /JS object 3 at offset 0x2AE8	175 bytes

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