PDF malware analysis — malicious · 8cd2fdb20c8140e7

MALICIOUS

PDF

43.5 KB

MD5: 330a88cb32f07f697a7b60ccaab42dac SHA-1: 0ee05e40b710a9324df3147c656f5b5edaf258b9 SHA-256: 8cd2fdb20c8140e7bf29fbdc45bc7e7261b6132c74e4ed4c01ef2e7a93ea1450

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains obfuscated JavaScript, indicated by the 'PDF_JS_OBFUSCATED_DROPPER' heuristic. This script is designed to evade analysis and likely functions as a dropper for further malicious content. The presence of U3D content related to CVEs and the use of annotation staging primitives suggest exploitation of PDF vulnerabilities. The script's anti-analysis checks and encoded payload point towards a multi-stage attack designed to download and execute additional malware.

Heuristics 6

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.
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` `2861a15de01f5fd9676dc68b2e571b8eba058a49159664cc143838d8d217fafb`	pdf-javascript-stream	PDF /JS object 5 at offset 0x14F	765 bytes
`legacy_pdfkit_stage_000.js` `5f4a1f71083e41537b1675b7ed1e8d6568d678cf38d7d142fab8d637d5aee48d`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C36	13174 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` `4d4e05ef4016a17102f66d7a7370c077e7b68a6d40a67f63242d9009e56acde5`	deobfuscated-js	PDF JavaScript deobfuscation pass	209996 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off0000419e.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x419E	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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