PDF malware analysis — malicious · fa8c813f9dcc47ee

MALICIOUS

PDF

36.0 KB First seen: 2022-03-23

MD5: 8aeaddeb780183768a16fcd6f903039e SHA-1: e7ba0ab57d6c6889b1f672255cde9392e3bc349a SHA-256: fa8c813f9dcc47ee3d29c654e8577174ba204a2351fdc3466070dd48446dafb8

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment

The PDF file contains embedded JavaScript, indicated by the PDF_JAVASCRIPT and PDF_JS heuristics. The PDF_EMBEDDED heuristic also suggests the presence of an embedded file. The document body is heavily obfuscated and appears to be image-based, likely serving as a lure. The embedded JavaScript is the primary mechanism for executing malicious actions, potentially downloading further payloads.

Machine Learning

Nyx PDF Classifier suspicious score 0.4138

Heuristics 6

JavaScript action low 2 related findings 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)
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 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)
Suspicious extracted artifact medium 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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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_obj0028.bin`	pdf-embedded-file	PDF EmbeddedFile object 28 at offset 0x3D45	21856 bytes
SHA-256: `7445c43593ec42e0339373a86905d250d36159309f5f5323939102ffdfd0ef6a`
Detection ClamAV: No threats found Obfuscation or payload: likely actual_type=ZIP; declared_or_context_type=PDF; filename=embedded_file_obj0028.bin; kind=pdf-embedded-file
`stream_010_off00008c66.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x8C66	979 bytes
SHA-256: `d363ab1387479504a5f70e1dc86c07a81763c7e25cdf96882eed12c21ad3873f`

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