PDF malware analysis — malicious · 372d63a4f1cf18ac

MALICIOUS

PDF

61.1 KB First seen: 2022-02-17

MD5: 0eb7ee1b58ca704358e30f36adf384d0 SHA-1: 0d34bf657b8ca22d22b732c1aaad741ef45c48eb SHA-256: 372d63a4f1cf18ac275c7e5e553ee1e3d9d76e5eefa4d0104152734d013176b4

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged by multiple heuristics including ML and ClamAV as malicious. It contains embedded JavaScript which is likely responsible for downloading and executing a secondary payload. The ClamAV detection name 'Xls.Downloader.94c25b356b5a6cac-9978798-0' indicates a downloader functionality.

Machine Learning

Nyx PDF Classifier malicious score 0.9674

Heuristics 7

ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.94c25b356b5a6cac-9978798-0
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0022.bin` `9147b8441039f2394e95c699ffdf77f446b85dd753ad1cffcd5b65bf0b8a4c25`	pdf-embedded-file	PDF EmbeddedFile object 22 at offset 0x193A	50376 bytes
Detection ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 Obfuscation or payload: likely Carved artifact entropy is 7.84, consistent with packed or encrypted content.
`stream_005_off0000ccd9.bin` `273270994f8bc3540df1f98f87ea5a0fedd04a2faf7266093c380d47ee63e846`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCCD9	33120 bytes
`stream_006_off0000f0a6.bin` `f2712eae29d4207ee3186fae882f1dc72f93d48d0ffc37133fbb03f30a3587ca`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF0A6	929 bytes

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