PDF malware analysis — malicious · 320891f8ddae40b2

MALICIOUS

PDF

42.6 KB Created: 2012-10-18 03:22:25 +04:00 Authoring application: http://www.instructables.com (via mPDF 5.0)

MD5: 19c3a9895836277501b9cc7feaffda01 SHA-1: 7458d72406cd19106b4db20476736cb5927e1921 SHA-256: 320891f8ddae40b2e57112981a4b375f745d0039e4c660dff7add226f0c9c4a2

66 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell

The PDF file was flagged as malicious by an ML classifier and contained heuristics indicating JavaScript obfuscation. An embedded JavaScript file was extracted, which likely serves to download and execute a secondary payload. The specific intent of the script could not be fully determined due to obfuscation, but its presence strongly suggests a malicious download and execution chain.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

Heuristics 3

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 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0029_000.js` `8139b0ff1cb1654f40fa2e0f4917ed84cccbab34fc1337b3c5ec2c588eb4b083`	pdf-javascript-stream	PDF /JS object 29 at offset 0xA2CB	130 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_off00001ac7.bin` `dcd1ba64d747e0bf0b9b8ecc270a7bea07ca4cd5917a768cd217f1d51287033b`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x1AC7	17772 bytes
`font_01_sfnt_off000048e2.bin` `a8ed3909966b10c026f46212f55dce68c94667ce1ac039797d3ebfa1d644dacf`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x48E2	17892 bytes
`font_02_sfnt_off00007722.bin` `4ee4e439b16220e78b319060a3d86ba95cd4b8614522dd4fa1d4df274793c516`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7722	18720 bytes

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