PDF malware analysis — malicious · 138d6b7c14089c46

MALICIOUS

PDF

536.5 KB First seen: 2022-06-10

MD5: 79dcdcb71122861b45027e992a8b256b SHA-1: 088e491b907fde82d39d4208d1edf6ddb43cb65e SHA-256: 138d6b7c14089c460dac2f723c91acb6436fdcc1b9dd9f03e711e035d4bd6620

88 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 is configured to launch an embedded file upon opening, as indicated by the 'PDF_JS_EXPORT_LAUNCH_DROPPER' heuristic. This JavaScript is likely responsible for executing a second-stage payload. The embedded file itself, named 'embedded_file_obj0034.bin', is a strong indicator of a dropper functionality.

Machine Learning

Nyx PDF Classifier suspicious score 0.4235

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_obj0034.bin` `6f8dabbd1d84de35de5ce2fb10eaa1808cacb8d9fa1c8ad8e809675df63e3dc7`	pdf-embedded-file	PDF EmbeddedFile object 34 at offset 0x28054	388856 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`stream_020_off00085df2.bin` `db956fa23afd97af7665e71547471db238739efa38dcff602869b0548344f9dc`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x85DF2	1228 bytes

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