PDF malware analysis — malicious · fe4d1302203d218b

MALICIOUS

PDF

61.1 KB First seen: 2022-02-16

MD5: de457b7a5b35e40bb74d462e3d7b7dbf SHA-1: ccaad2db7da94ff9981c8f318cad2c7c2a9132c8 SHA-256: fe4d1302203d218bc68664762e7a481c8e06cbb1d6aca13aa0a6e7b2b0d7f2c6

178 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded file and JavaScript stream suggest the PDF is designed to download and execute a secondary stage, likely a downloader or dropper, as indicated by the ClamAV signature 'Xls.Downloader.94c25b356b5a6cac-9978798-0'.

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` `55e5c9a04beb12056af49c32f84fbb0de6c9cef1cb624daff1851bb91941121d`	pdf-embedded-file	PDF EmbeddedFile object 22 at offset 0x1939	50424 bytes
Detection ClamAV: Xls.Downloader.94c25b356b5a6cac-9978798-0 Obfuscation or payload: likely Carved artifact entropy is 7.83, consistent with packed or encrypted content.
`stream_005_off0000cd14.bin` `273270994f8bc3540df1f98f87ea5a0fedd04a2faf7266093c380d47ee63e846`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xCD14	33120 bytes
`stream_006_off0000f0e1.bin` `9723d90a4d7b32489891627727703e64a23695d030be30af9f7d9579246bbfd3`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0xF0E1	929 bytes

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