PDF malware analysis — malicious · 858b486b3884f1c2

MALICIOUS

PDF

43.8 KB

MD5: 564774356de290bb8879b8bcf3d1df2f SHA-1: df600be66aadab99c88e54a285f80f0500b0fe25 SHA-256: 858b486b3884f1c20150347f5b3c92c58d0c17e967e8b887f2f31d54e26281f7

166 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains obfuscated JavaScript, indicated by the 'PDF_JS_OBFUSCATED_DROPPER' heuristic. This script is designed to exploit a vulnerability, likely related to the U3D content found in the file, to download and execute a second-stage payload. The ClamAV detection 'Pdf.Exploit.Agent-20646' further confirms its malicious nature. The presence of deobfuscated JavaScript files suggests a multi-stage attack.

Heuristics 7

U3D/3D content in PDF — Adobe Reader 3D parser CVE-family indicator high CVE related PDF_U3D_CVE_RELATED

PDF contains U3D (Universal 3D) or 3D annotation content — CVE-2011-2462 and CVE-2009-3953 are critical vulnerabilities in Adobe Reader's U3D processing that allow arbitrary code execution. U3D content in PDFs is extremely rare in normal documents.
ClamAV: Pdf.Exploit.Agent-20646 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-20646
Obfuscated multi-stage PDF JavaScript dropper high PDF_JS_OBFUSCATED_DROPPER

PDF JavaScript shows 3 independent signals of exploit-kit-style multi-stage obfuscation: annot_subject_stage, hex_dashed_payload, repeated_pluginschk. This is strongly consistent with pre-2011 Adobe Reader PDF droppers — OpenAction JS reads encoded data from annotation subjects, decodes it through one or more hex / base-N loops, and invokes eval indirectly (method name built one character at a time). The actual CVE is hidden in the final decoded layer and is not visible via static analysis.
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.
syncAnnotScan annotation-staging primitive low PDF_FOXIT_SYNCANNOTSCAN

PDF JavaScript calls syncAnnotScan() — a no-op annotation-enumeration primitive used by exploit-kit JavaScript to stage payload reads from annotation /Subject fields before eval(). Not a vulnerable sink itself; rarely seen in legitimate PDFs. (matched in decompressed stream)
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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `f403b4a2293166a0ac63d536bc8c65da60d322afd1d3d0554118a10f985ad0e9`	pdf-javascript-stream	PDF /JS object 5 at offset 0x14F	726 bytes
`legacy_pdfkit_stage_000.js` `75785c2747956f14ffe57fa0838071a609da12577b8be4c1dd0ae2415df85bb3`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1D16	12670 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `4f7fe9e2fb3385760c1a6f5588400dbf58a441967913165a52ae3df5b88d7301`	deobfuscated-js	PDF JavaScript deobfuscation pass	209837 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off0000431e.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x431E	28021 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact entropy is 7.79, consistent with packed or encrypted content.

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