Formbook PDF malware analysis — malicious · da9c3deb08bfc6a2

MALICIOUS

PDF

228.1 KB First seen: 2022-03-08

MD5: 309e9ca72fafe0247cc84fbebf448bbc SHA-1: 294d792e066dbda1d0b45005a2aaa117f56442a7 SHA-256: da9c3deb08bfc6a2e7930a4c8f1bd81b5ebffbb09b44027c74ea41ebf7149f8b

178 Risk Score

Malware Insights

Formbook · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The file was detected as malicious by ClamAV with the signature Doc.Downloader.Formbook-bc97c1e0c33c3c93-9951465-0. Static analysis also identified embedded JavaScript and an embedded file, both common techniques for delivering secondary payloads. The ML classifier strongly supports the malicious verdict. The presence of JavaScript suggests an attempt to download and execute a further stage.

Machine Learning

Nyx PDF Classifier malicious score 0.9655

Heuristics 7

ClamAV: Doc.Downloader.Formbook-bc97c1e0c33c3c93-9951465-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Formbook-bc97c1e0c33c3c93-9951465-0
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0022.bin` `825b7a64db82a61656c8004bef49823d5b9fe4f52fae744f5dc927b3e75a994b`	pdf-embedded-file	PDF EmbeddedFile object 22 at offset 0x5544	191192 bytes
Detection ClamAV: Doc.Downloader.Formbook-bc97c1e0c33c3c93-9951465-0 Obfuscation or payload: likely Carved artifact entropy is 7.96, consistent with packed or encrypted content.
`stream_006_off00038cfd.bin` `84beff109198d8a7db681427b843deb0b34f6987045d372eb9991221f1853439`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x38CFD	929 bytes

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