PDF malware analysis — malicious · f33ec56bf1ea0506

MALICIOUS

PDF

25.7 KB

MD5: a9f311dbc27cc30fa03787e3c7390d97 SHA-1: a17a682be9f981082b5f8eb76121aa09448d87ac SHA-256: f33ec56bf1ea0506cb9623e66f0bcb0df92279d75259a461b44f8eac0892dd4b

196 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.002 Malicious File T1059.003 Windows Command Shell

The file is a PDF document detected by ClamAV as Doc.Exploit.CVE_2017_11882-6934206-0, indicating exploitation of the CVE-2017-11882 vulnerability. It contains embedded JavaScript and an embedded file named 'jaaa.doc'. The JavaScript actions and embedded file suggest the PDF is designed to download and execute a secondary payload, likely leveraging the known Office Equation Editor vulnerability.

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
`jaaa.doc` `52d06ce3bf094dfa1c91b44e165bb534204d83f8a653c658c4b0f3fd26159fc3`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x387	8326 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` `a3efc2fc4cb1cdeabf36a1c4822081c972066b54dc586b7b4dabcc496a33926c`	pdf-javascript-stream	PDF /JS object 9 at offset 0x6505	57 bytes
`javascript_obj0009_001.js` `0278325046d7043fa96cee0ea96435724ff50eb8988ead25bc73658a26281cb2`	pdf-javascript-stream	PDF /JS object 9 at offset 0x6505	55 bytes

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