PDF malware analysis — malicious · f477c1952259d5da

MALICIOUS

PDF

43.7 KB

MD5: da4e97b1cc4621affcd157f1bdf1b5bf SHA-1: c5aabeb1f8bb452d3ed3a180b13ff0d0809a22b3 SHA-256: f477c1952259d5daacf4f358a0636cc3d25ff021535e95a1d1f07d917f3671d8

136 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains obfuscated JavaScript, flagged as a 'PDF_JS_OBFUSCATED_DROPPER'. This script is designed to download and execute a second-stage payload, indicated by the heuristic firings and the presence of deobfuscated JavaScript files. The ML classifier strongly supports the malicious nature of this PDF. The U3D content also suggests a potential exploit vector.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

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` `a2765ef4bc176af71164210608f93ccd0cfd1d5803648c48f5d630ef03f5faa9`	pdf-javascript-stream	PDF /JS object 5 at offset 0x14F	749 bytes
`legacy_pdfkit_stage_000.js` `7a96f79968cd84c1038fa20838352713a80a9e2923c7962cf14393de2d3fc2f1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1C7B	13331 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` `e4c93e24444c46851e4be69e2ddb3655b93dd2e07c7f39a864c120eec6123a0c`	deobfuscated-js	PDF JavaScript deobfuscation pass	210059 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`u3d_00_off000042b0.bin` `fb27c6f6ffe2b08a88f79f344ef3cb4f85460ac81a062194b6fd84ab6e48b628`	pdf-3d-stream	PDF U3D 3D stream at offset 0x42B0	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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