PDF malware analysis — malicious · fae27214f69c6827

MALICIOUS

PDF

476.4 KB First seen: 2022-06-08

MD5: 8951d58845bb1e1541624941a7637585 SHA-1: 8150f03be67e745f4cb79f981f104aecaabebd9e SHA-256: fae27214f69c6827a706a1d7d357bcf4d9be871a3a5e70d0dc8d93032c7140aa

88 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains JavaScript that utilizes the exportDataObject and nLaunch functions, indicating it is designed to drop and execute an embedded file. The heuristic 'PDF_JS_EXPORT_LAUNCH_DROPPER' confirms this behavior. The embedded file 'embedded_file_obj0031.bin' is the primary artifact of interest. No specific family could be identified.

Machine Learning

Nyx PDF Classifier suspicious score 0.4031

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)
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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. (matched inside decoded stream)
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. (matched inside decoded stream)
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 2 image XObject(s) and the content stream contains no text-emitting operators (BT/ET, Tj, TJ, ', ") in either raw bytes or decompressed streams — this is the screenshot-as-PDF pattern used to bypass text-based scanners and to deliver instructions purely through rendered pixels. It is informational unless paired with invisible links or risky URI context.
Suspicious extracted artifact info 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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0031.bin` `80770b0d9820351a652ef1ec3e3ff5cdc966a892f22aaf153aece9d12568f1ff`	pdf-embedded-file	PDF EmbeddedFile object 31 at offset 0x190C7	388840 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`stream_016_off00076da9.bin` `ec2e1858f27fd5408ecb5d9a6467ce0bb72607c07eb55f991c8032075cf3db03`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x76DA9	1134 bytes

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