PDF malware analysis — malicious · 6d45a03b32c4a9ba

MALICIOUS

PDF

236.8 KB First seen: 2022-06-24

MD5: 96d95ee6d0c9da16d245579ad1ff2e9f SHA-1: f852ac58b11e6b314271e2afdd33da84fc3cb8d8 SHA-256: 6d45a03b32c4a9bab48c75bec8443b5af40ae43e055db77796a6328cb6e87ffe

86 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical heuristic 'PDF_JS_EXPORT_LAUNCH_DROPPER' indicates that this PDF is designed to launch an embedded object, likely a second-stage payload. The presence of JavaScript actions and an embedded JS stream further supports this, suggesting the script is responsible for the download and execution. The file's purpose is to act as a dropper for further malicious activity.

Machine Learning

Nyx PDF Classifier suspicious score 0.4872

Heuristics 5

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.

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0037.bin` `30d5632ef75e81aa6a48eae64f2155acc39e64f6367a5c6152e8ec74b44ac6de`	pdf-embedded-file	PDF EmbeddedFile object 37 at offset 0x36DAD	20040 bytes
`stream_022_off0003aee0.bin` `1f13146812c2fb9994c753ce93617aa374318e16d721aeb2b6d73a1391118df4`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3AEE0	1248 bytes

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