PDF malware analysis — malicious · d6819f84ecbd596d

MALICIOUS

PDF

27.5 KB Created: 2011-05-26 16:37:07 +03:00 Authoring application: bing.wiki.usfca.edu (via mPDF 5.0)

MD5: 2bb0a050950d8d2624b808a262131f4b SHA-1: 3e919f0f1eb223c23964621707deaa79d62f7d79 SHA-256: d6819f84ecbd596d6ee147d8300626870013fcd1533c811351649ec78405f66b

108 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 JavaScript T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including PDF_JAVASCRIPT and PDF_JS. The ML classifier strongly flagged this PDF as malicious. The JavaScript stream was obfuscated using unescape(), suggesting an attempt to hide malicious code. The primary attack vector appears to be the execution of this embedded script, which is a common method for delivering further malicious payloads.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

Heuristics 4

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.

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0022_000.js` `10e15f9e8e631690248396d575e9652903435250e89141f7cc58e4b3e9b10d1b`	pdf-javascript-stream	PDF /JS object 22 at offset 0x66E0	136 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).
`stream_003_off0000116b.bin` `ded1520fd68b91798ef4502ba393be29e6762be445da6319489229b957e57958`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x116B	17756 bytes
`font_01_sfnt_off00003f7d.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3F7D	17892 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.