PDF malware analysis — malicious · a5e7898550695275

MALICIOUS

PDF

43.9 KB

MD5: 7c94524c5fb90ec94017403b692bf992 SHA-1: 2117a4061746f3cdd536d436162345f15ebbf6a1 SHA-256: a5e7898550695275872fd53066296990bfb71ae1dcc620d4f68fe9ebdd4a5f25

106 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF contains obfuscated JavaScript, identified by the 'PDF_JS_OBFUSCATED_DROPPER' heuristic. This script is designed to download and execute a second-stage payload, as indicated by the presence of deobfuscated JavaScript files and a U3D stream. The 'PDF_U3D_CVE_RELATED' heuristic suggests potential exploitation of Adobe Reader 3D vulnerabilities. The exact download URL or execution method is not directly extractable due to obfuscation, but the overall pattern points to a multi-stage attack.

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` `8c65bfb370d7bf87a49e768ed4d0b37b1abeed6b76c218597f0d1aa4b71efd8a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x14F	720 bytes
`legacy_pdfkit_stage_000.js` `154150b0c1918293eba07e640c8616ba97702d01447ad6827ea4b9b8cd954e76`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1D01	13207 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` `ad0dfd1ecaf928ca22f9a6d1ebe22289a8a8b6c8491e221080c0d556398dade9`	deobfuscated-js	PDF JavaScript deobfuscation pass	208265 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off00004351.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x4351	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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