PDF malware analysis — malicious · 44c521eff9b5bfc1

MALICIOUS

PDF

20.6 KB Created: 2009-09-29 19:45:31 Authoring application: PDF Library 2.6.5 (via PDF Library 4.8.2)

MD5: ac66e23049fb41d143a5caa8d700b950 SHA-1: dcdd5687c3338bb507efea4033bd130f6971e1c7 SHA-256: 44c521eff9b5bfc1785cd8dd387f92391cef53c04f0eeff5048c0a6ab4359287

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1027 Obfuscated Files or Information

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis detected embedded JavaScript and the use of unescape() and ASCIIHexDecode filters, indicating obfuscation techniques. The presence of a suspicious JavaScript file (javascript_obj0007_000.js) further supports the likelihood of malicious intent, likely to download and execute a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
ASCIIHexDecode filter (with exploit indicators) medium PDF_FILTER_HEX

Hex-encoding filter present alongside exploit delivery indicators — often used to hide payload or shellcode bytes
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.
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PSSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `f3435864eaecdaaf879a134106d4d083bf6f208dec78039a00954c204c567b67`	pdf-javascript-stream	PDF /JS object 7 at offset 0x268	22622 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 hex-escaped blob(s).

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