PDF malware analysis — malicious · 8e96824ab25f99a4

MALICIOUS

PDF

8.0 KB

MD5: 6ca81692898a1bb34a4cda21897b292f SHA-1: 05cad834174607e1b8e39a04975b231cd30f83f4 SHA-256: 8e96824ab25f99a4d75ff127894ea023d074006f34b2614ff62514233ced11df

124 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF contains embedded JavaScript, which is heavily obfuscated using eval() and unescape() calls. Analysis of the deobfuscated JavaScript indicates it is designed to download and execute a second-stage payload. The high number of heuristic firings related to JavaScript and obfuscation, along with the suspicious extracted artifacts, strongly suggests a malicious intent.

Heuristics 6

eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Suspicious extracted artifact medium 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.
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)

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `b28a3ca1b28bafdd5ba590efba1d8e94645dacd02d9ba3979ac960fd22adceb1`	pdf-javascript-stream	PDF /JS object 7 at offset 0x195	111 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s).
`legacy_pdfkit_stage_000.js` `d2066c61096da74fda73823dccec3d8231a647630961775fe9dc675c33e2c5e8`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x273	16084 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).
`deobfuscated.js` `deb224dc87e0d0d0a644575ed71d587e630e3f365d330d62fe0e05deea6567f5`	deobfuscated-js	PDF JavaScript deobfuscation pass	56336 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 4 eval/decoder/string-building token(s). Carved artifact contains 1 long hex-escaped blob(s).

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