PDF malware analysis — malicious · 6dbb430db2ecd05c

MALICIOUS

PDF

811.6 KB

MD5: ad9b044bb309d00a074d8374d2f17566 SHA-1: 4d66c3f2f833cdf448d9264115cd3129ef49fd00 SHA-256: 6dbb430db2ecd05c70e03c62f074d8def8acb1c7bd9f6739d0b3c318304d01bd

156 Risk Score

Malware Insights

MITRE ATT&CK

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

The PDF contains JavaScript that is flagged as an exploit cluster, utilizing String.fromCharCode. This script is designed to launch an embedded file, indicated by the 'PDF_JS_EXPORT_LAUNCH_DROPPER' heuristic. The embedded file, named 'embedded_file_obj0022.bin', is likely a second-stage payload. The presence of JavaScript and the launch mechanism strongly suggest an attack pattern involving spearphishing attachments leading to client-side exploitation.

Machine Learning

Nyx PDF Classifier suspicious score 0.3269

Heuristics 8

PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
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)
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
PDF paints image(s) but contains no text operators info PDF_IMAGE_ONLY_LURE

PDF has 1 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_obj0022.bin` `945fa2d9e0d7dbbafc2674faf2ac3efa69544881d576eb9bf2e996376e4d00dc`	pdf-embedded-file	PDF EmbeddedFile object 22 at offset 0x60AC2	442368 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.99, consistent with packed or encrypted content.
`stream_000_off000000e1.bin` `54771539aa7137dd69ca43d700f6ccd5a112698bac1668929a920bdbd78e654e`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE1	963 bytes

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