PDF malware analysis — malicious · 97ac683baff356f1

MALICIOUS

PDF

12.7 KB

MD5: 9fb8acd92264b74f034cd5c2fd882f46 SHA-1: 5f0c344816785b4a84be90116c8ab28081644ee6 SHA-256: 97ac683baff356f13ceff12bb2e65978084f5d80cd0cd7ed12288ceddf787ac8

78 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. The critical 'CVE_2007_5659' heuristic specifically points to the use of 'Collab.collectEmailInfo' to execute JavaScript. This JavaScript is likely used to download and execute a second-stage payload, as suggested by the extracted files 'legacy_pdfkit_stage_000.js' and 'legacy_pdfkit_stage_001.js'. The document body is unreadable, but the presence of exploit-related heuristics and embedded scripts strongly suggests a malicious intent.

Heuristics 4

Collab.collectEmailInfo — CVE-2007-5659 critical CVE exact CVE_2007_5659

PDF JavaScript calls Collab.collectEmailInfo — CVE-2007-5659 is a buffer overflow in Adobe Reader triggered by a long argument or heap-sprayed message field passed to Collab.collectEmailInfo(). Part of a series of Acrobat JS API exploits. (identified after JavaScript deobfuscation)
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.
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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj0007_000.js` `1847af0a099665b6ac45af66402e56ed64237a1b287618ee3d6643267fda6f35`	pdf-javascript-stream	PDF /JS object 7 at offset 0x19D	343 bytes
`legacy_pdfkit_stage_000.js` `b8d55c5e5ab9a96087dfcdaaf0665ff7d0f3b94d1fc70ff0a64617c1ac40f018`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12362 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `c4a957f53125952b41f41247f45126e9da340ddd204e942f6ca63d1a14397480`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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