PDF malware analysis — malicious · e83df64bb833e66c

MALICIOUS

PDF

22.8 KB

MD5: aab4d97d78c6caba58c51d2656a31aac SHA-1: a58cd7a09d085a9e546ba7b70617d58ff515affc SHA-256: e83df64bb833e66ccedd467be44d4139975c3bfc12bbe555fb1624ebf02f41b2

196 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution

The file is a PDF that contains embedded JavaScript and an embedded OLE object, identified as a Microsoft Word document. ClamAV detections and heuristic firings strongly indicate exploitation of CVE-2017-11882, a known vulnerability in Microsoft Office Equation Editor. The embedded document, CVE-2017-11882_DOC_TEST.doc, is likely the payload or a component thereof. The embedded JavaScript streams are obfuscated but likely contribute to the exploitation or payload delivery.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Exploit.CVE_2017_11882-6934206-0
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.
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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
`CVE-2017-11882_DOC_TEST.doc` `b80aec00873cc29f91d86a2bb5b1de9e0e5a9daeae4aa41bebb183a23d5ce790`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x3B8	7343 bytes
Detection ClamAV: Doc.Exploit.CVE_2017_11882-6934206-0 Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0009_000.js` `b4c73dbca8b6744ee8e94da7af52bfffc6460b8f49697159ea038dbb248c217b`	pdf-javascript-stream	PDF /JS object 9 at offset 0x59AF	76 bytes
`javascript_obj0009_001.js` `4902dcda113f6a622fe1426000c240a0dfcaec29a955ee34ca483cafe5514add`	pdf-javascript-stream	PDF /JS object 9 at offset 0x59AF	74 bytes

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