PDF malware analysis — malicious · e00c46fdbc5e0fab

MALICIOUS

PDF

12.9 KB

MD5: 77cb0f91e6600ed95fa7be8beeec8a3b SHA-1: 9599d12ed31a40f080d20a5cf8a0b5b27237f772 SHA-256: e00c46fdbc5e0fab4326f1b5e235874a6a37f70be29ae2bc7d7c176ee1b3bddf

138 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF sample contains embedded JavaScript, indicated by multiple heuristic firings including 'PDF_JAVASCRIPT' and 'PDF_JS'. Specifically, the 'CVE_2007_5659' and 'PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER' rules highlight the use of a PDF launcher that concatenates info fields, extracts characters at a fixed stride, and evaluates the result, which is a known technique for exploiting older PDF vulnerabilities. The extracted JavaScript files ('legacy_pdfkit_stage_000.js', 'legacy_pdfkit_stage_001.js') likely contain the malicious payload, although their specific actions are not detailed here. The presence of these elements strongly suggests an exploit attempt.

Heuristics 5

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)
Annotation subject percent-decoding eval stager critical PDF_ANNOT_SUBJECT_MARKER_EVAL_STAGER

OpenAction JavaScript forces annotation enumeration, reads an annotation /Subject payload with getAnnots(), rewrites marker bytes into percent escapes, decodes it with unescape(), and dispatches it through eval. This is a high-confidence exploit-kit staging pattern. It is intentionally not mapped to CVE-2009-1492 unless getAnnots() itself carries the crafted integer or long argument shape for that vulnerability.
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` `d947b64bbb308e51f0de2c5508ba80e2712ecd49695b68fd42d5546791505a72`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	12612 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`legacy_pdfkit_stage_001.js` `4e9530e19247812bd730ff323a9a548d5fa45f69af91afcb3b845c433c592326`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x2F0	5212 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 5 eval/decoder/string-building token(s).

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