PDF malware analysis — malicious · 7ebeeedb2ab3165d

MALICIOUS

PDF

16.2 KB

MD5: e22e1144a0adddff3afed7dc900662b9 SHA-1: ee8edb5bccfc80edb7ff98b8585cecc8d1a2a8cf SHA-256: 7ebeeedb2ab3165db85ce939569e1befd0157930a2408d672cc039109c967aaf

164 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. High-confidence heuristics indicate it's an obfuscated multi-stage JavaScript dropper. The embedded JavaScript, particularly the deobfuscated version, is responsible for downloading and executing a second-stage payload, which is the primary malicious action.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 7

ClamAV: Pdf.Exploit.Agent-19400 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Exploit.Agent-19400
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0005_000.js` `81fdb05c9ba27a2dd95b2d25bc25604a628d50371f8d663c55e6fb138eefaa2a`	pdf-javascript-stream	PDF /JS object 5 at offset 0x148	694 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `533ef21e24de31548c67b9fa697d0d9a59268ff1419bc8a8c857754bf621e730`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x1BCC	12278 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` `e027b306c9b120aa8d201bdc6f41815a63327b74d4ff24573a28f870f5419238`	deobfuscated-js	PDF JavaScript deobfuscation pass	63721 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 6 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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