PDF malware analysis — malicious · b6c4cf44fcd9fa22

MALICIOUS

PDF

502.5 KB

MD5: c06dfacf945b0e8acf391bf26be00e4a SHA-1: ea7b0443e0427bda88296bc8cdbc1e8a5a48b013 SHA-256: b6c4cf44fcd9fa229308d8e606260b004dda74127249eefee9bd3265a39cb53a

66 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains an embedded file and JavaScript, indicating an attempt to deliver a secondary payload. The ML classifier flagged this PDF as malicious. The embedded file 'embedded_file_obj0022.bin' is the primary indicator of malicious intent. The JavaScript, while obfuscated, likely facilitates the execution of the embedded artifact.

Machine Learning

Nyx PDF Classifier malicious score 0.5977

Heuristics 6

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` `79fb5469834e7360e78fab4c6dacb9f78911c042f7718e0ea9733eac3376120a`	pdf-embedded-file	PDF EmbeddedFile object 22 at offset 0x60ABD	147456 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.80, consistent with packed or encrypted content.
`stream_000_off000000e1.bin` `3024df63ef5723b8a3b0b2a286e823d570e168391ec5e3122cccc92fdfe48e7d`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xE1	938 bytes

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